{"product_id":"fish-flex","title":"Fish Flex (Fix Flex) Cephalexin 500mg \u0026 250mg Fish Antibacterial","description":"\u003cstyle\u003e\n  .fph-product-copy {\n    --fph-text: #1f2937;\n    --fph-heading: #111827;\n    --fph-border: #d9dde6;\n    --fph-surface: #f8fafc;\n    --fph-surface-alt: #f3f5f8;\n    --fph-accent: #143583;\n    --fph-danger: #c62828;\n    --fph-warning: #f59e0b;\n    --fph-radius: 18px;\n    color: var(--fph-text);\n    font-size: clamp(15px, 1.05vw, 17px);\n    line-height: 1.75;\n    overflow-wrap: break-word;\n  }\n\n  .fph-product-copy,\n  .fph-product-copy * {\n    box-sizing: border-box;\n  }\n\n  .fph-product-copy .fph-section \u003e * + *,\n  .fph-product-copy .fph-acc-body \u003e * + *,\n  .fph-product-copy .fph-more-body \u003e * + * {\n    margin-top: clamp(14px, 2vw, 20px);\n  }\n\n  .fph-product-copy h2 {\n    margin: 0;\n    color: var(--fph-heading);\n    font-size: clamp(23px, 2.6vw, 33px);\n    line-height: 1.24;\n    letter-spacing: 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clamp(16px, 2.4vw, 22px);\n  }\n\n  \/* --- Inline Warning --- *\/\n  .fph-product-copy .fph-inline-warning {\n    color: var(--fph-danger);\n    font-weight: 700;\n  }\n\n  \/* --- Section scroll offset (kept: section ids stay linkable) --- *\/\n  .fph-product-copy [id] {\n    scroll-margin-top: 80px;\n  }\n\n  \/* --- Responsive --- *\/\n  @media (max-width: 989px) {\n    .fph-product-copy .fph-card-list,\n    .fph-product-copy .fph-info-grid {\n      grid-template-columns: 1fr;\n    }\n  }\n\n  @media (max-width: 767px) {\n    .fph-product-copy {\n      font-size: 15px;\n      line-height: 1.68;\n    }\n\n    .fph-product-copy h2 {\n      font-size: clamp(22px, 7vw, 28px);\n    }\n\n    .fph-product-copy .fph-step-list li {\n      padding: 64px 16px 16px;\n    }\n\n    .fph-product-copy .fph-step-list li::before {\n      top: 16px;\n      left: 16px;\n    }\n  }\n\u003c\/style\u003e\n\u003cdiv class=\"fph-product-copy\"\u003e\n\u003csection id=\"fph-intro\" class=\"fph-section\"\u003e\n\u003ch2\u003eFish Cephalexin 500mg \u0026amp; 250mg for Fin Rot, Skin Ulcers and Infected Wounds in Freshwater and Saltwater Tanks\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eFish Flex (Fix Flex)\u003c\/strong\u003e is a fish cephalexin 500mg and 250mg capsules for ornamental aquarium fish and non-food pet birds. Aquarists use it for bacterial infections such as fin and tail rot, skin ulcers, and infected wounds, at 250 mg per 10 gallons or 500 mg per 20 gallons, every 24 hours for 5 to 10 days.\u003c\/p\u003e\n\u003cp\u003eOften called Fish Flex, Fin Flex or simply fishflex in the hobby community, this product is an online alternative to the discontinued Thomas Labs Fish Flex, Fish Flex Forte, Fish Aid Cephalexin, Aqua Ceph 500mg, Aqua Flex and FISHBIOTIC Cephalexin products. Aquarists and bird keepers also search for it as fish cephalexin, fish cephalexin 500mg, cephalexin for fish, or fish keflex. It helps manage common bacterial issues such as fin and tail rot, skin ulcers, infected wounds and lesions, red patches, pop-eye, and dropsy (pinecone disease) in freshwater and saltwater aquariums. Bird keepers also use it, under veterinary guidance, for conditions like bumblefoot, skin infections or joint infections in pigeons and other non-food pet birds.\u003c\/p\u003e\n\u003cp\u003eStart treatment early, at the first signs of bacterial stress. Those signs differ between fish and birds, so use the lists below to know what to watch for.\u003c\/p\u003e\n\u003cp class=\"fph-alert\"\u003e\u003cstrong\u003eImportant Notice:\u003c\/strong\u003e This product is \u003cstrong\u003eintended for aquarium and ornamental fish and pet birds only\u003c\/strong\u003e. It is \u003cstrong\u003enot for animals used for food\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cdetails class=\"fph-more\"\u003e\n\u003csummary\u003e\u003cspan class=\"fph-more-open\"\u003eSee More +\u003c\/span\u003e\u003cspan class=\"fph-more-close\"\u003eSee Less −\u003c\/span\u003e\u003c\/summary\u003e\n\u003cdiv class=\"fph-more-body\"\u003e\n\u003cdiv class=\"fph-info-grid\"\u003e\n\u003cdiv class=\"fph-info-card\"\u003e\n\u003ch3\u003eFish-Specific Symptoms\u003c\/h3\u003e\n\u003cul class=\"fph-symptom-list\"\u003e\n\u003cli\u003eFin and tail rot (frayed or ragged fins)\u003c\/li\u003e\n\u003cli\u003eSkin ulcers, open sores and infected wounds\u003c\/li\u003e\n\u003cli\u003eRed patches or cloudy patches on the body\u003c\/li\u003e\n\u003cli\u003ePop-eye (exophthalmia)\u003c\/li\u003e\n\u003cli\u003eDropsy (pinecone disease)\u003c\/li\u003e\n\u003cli\u003eLoss of appetite or listless behavior\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"fph-info-card\"\u003e\n\u003ch3\u003eBird-Specific Symptoms (Under Veterinary Guidance)\u003c\/h3\u003e\n\u003cul class=\"fph-symptom-list\"\u003e\n\u003cli\u003eBumblefoot (swollen foot pads)\u003c\/li\u003e\n\u003cli\u003eSkin infections or redness\u003c\/li\u003e\n\u003cli\u003eJoint infections or swelling\u003c\/li\u003e\n\u003cli\u003eRuffled feathers\u003c\/li\u003e\n\u003cli\u003eReduced activity\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003eFix Flex is formulated, labeled and sold exclusively as an antibacterial treatment for ornamental aquariums and pet birds.\u003c\/p\u003e\n\u003cp class=\"fph-tip\"\u003e\u003cstrong\u003eOrder online\u003c\/strong\u003e for same-day dispatch on orders placed before 1:30 p.m. CT, Monday through Friday. Your order ships directly from our U.S. warehouse via USPS or UPS.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/section\u003e\n\u003chr\u003e\n\u003cdetails id=\"fph-comparison\" class=\"fph-acc\"\u003e\n\u003csummary\u003e\n\u003ch2\u003eFish Flex vs Fix Flex: What Changed?\u003c\/h2\u003e\n\u003c\/summary\u003e\n\u003cdiv class=\"fph-acc-body\"\u003e\n\u003cp\u003eIf you previously purchased Thomas Labs Fish Flex, Fish Flex Forte, Aqua Ceph, Aqua Flex or FISHBIOTIC Cephalexin, here is what has changed and what remains the same:\u003c\/p\u003e\n\u003cdiv class=\"fph-info-grid\"\u003e\n\u003cp class=\"fph-info-card\"\u003e\u003cstrong\u003eSame Cephalexin\u003c\/strong\u003e The replacement contains the same \u003cstrong\u003ecephalexin\u003c\/strong\u003e per capsule that you relied on with Fish Flex and Aqua Ceph, and it targets the same bacteria.\u003c\/p\u003e\n\u003cp class=\"fph-info-card\"\u003e\u003cstrong\u003eNew Manufacturer\u003c\/strong\u003e The new product is made by \u003cstrong\u003eAqua Soma Labs\u003c\/strong\u003e, replacing the discontinued Thomas Labs line, and is manufactured in the United States.\u003c\/p\u003e\n\u003cp class=\"fph-info-card\"\u003e\u003cstrong\u003eSame Capsule Form\u003c\/strong\u003e It uses the same \u003cstrong\u003ecapsule\u003c\/strong\u003e format as the original Fish Flex, making it easy to open and dissolve the powder in aquarium water or mix with soft food for birds.\u003c\/p\u003e\n\u003cp class=\"fph-info-card\"\u003e\u003cstrong\u003eAvailable in Two Strengths and Two Sizes\u003c\/strong\u003e Choose \u003cstrong\u003e250 mg\u003c\/strong\u003e or \u003cstrong\u003e500 mg\u003c\/strong\u003e capsules in bottles of \u003cstrong\u003e30 or 100\u003c\/strong\u003e, matching the flexibility that Fish Flex and Fish Flex Forte offered for different aquarium volumes and treatment plans.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails id=\"fph-benefits\" class=\"fph-acc\"\u003e\n\u003csummary\u003e\n\u003ch2\u003eBenefits of Fix Flex for Fish \u0026amp; Birds\u003c\/h2\u003e\n\u003c\/summary\u003e\n\u003cdiv class=\"fph-acc-body\"\u003e\n\u003cul class=\"fph-card-list\"\u003e\n\u003cli\u003e\n\u003ch3\u003eBacterial Support for Fish and Birds\u003c\/h3\u003e\n\u003cp\u003eThis treatment provides cephalexin coverage for aquarium fish and pet birds. It helps manage common problems such as fin and tail rot, skin ulcers, infected wounds, red patches and early signs of bacterial stress when used as directed.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ch3\u003eMade in the United States\u003c\/h3\u003e\n\u003cp\u003eFix Flex is made in the United States by Aqua Soma Labs. Domestic production supports consistent capsule quality from batch to batch, which matters when you are treating fish or birds in a hospital tank or cage.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ch3\u003eTwo Strengths to Match Your Tank\u003c\/h3\u003e\n\u003cp\u003eUse \u003cstrong\u003e250 mg\u003c\/strong\u003e capsules for smaller aquariums, hospital tanks or lightly stocked systems, and \u003cstrong\u003e500 mg\u003c\/strong\u003e capsules for larger volumes or when higher total amounts are needed, always following the label directions.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ch3\u003eConsistent Capsules\u003c\/h3\u003e\n\u003cp\u003eEach capsule delivers a consistent amount of cephalexin, making it easier to scale treatment from a single quarantine tank up to larger community aquariums, lofts or aviaries without complicated calculations.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ch3\u003eEasy to Use\u003c\/h3\u003e\n\u003cp\u003eThese capsules can be opened and the powder dissolved directly in aquarium water or mixed with soft food, providing flexible options for shy, stressed or hard-to-handle fish and birds while minimizing handling and extra stress.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ch3\u003eWorks in Freshwater, Saltwater \u0026amp; Aviary Setups\u003c\/h3\u003e\n\u003cp\u003eHobbyists reach for this treatment in both freshwater and marine systems, and as a convenient option for pigeons and other ornamental birds kept in lofts, cages or aviaries when an antibacterial treatment is appropriate.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ch3\u003eGood for Hospital Tanks and Quarantine\u003c\/h3\u003e\n\u003cp\u003eUsing this treatment in a separate hospital tank or treatment cage helps protect the main aquarium's biofilter and reduces unnecessary exposure of healthy tank mates or flock members while you focus treatment where it is needed most.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails id=\"fph-dosage\" class=\"fph-acc\"\u003e\n\u003csummary\u003e\n\u003ch2\u003eUsage Guidelines \u0026amp; Instructions\u003c\/h2\u003e\n\u003c\/summary\u003e\n\u003cdiv class=\"fph-acc-body\"\u003e\n\u003cp\u003e\u003cstrong\u003eDirections for Use:\u003c\/strong\u003e\u003c\/p\u003e\n\u003col class=\"fph-step-list\"\u003e\n\u003cli\u003e\n\u003ch3\u003eSet Up a Separate Treatment Area\u003c\/h3\u003e\n\u003cp\u003eMove affected fish to a dedicated hospital tank and, where practical, house birds needing treatment in a small treatment cage. This helps protect healthy tank mates or flock members and lets you control the amount more precisely.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ch3\u003eChoose the Right Strength\u003c\/h3\u003e\n\u003cp\u003eThese cephalexin capsules are available in \u003cstrong\u003e250 mg\u003c\/strong\u003e and \u003cstrong\u003e500 mg\u003c\/strong\u003e strengths. Select the strength that matches your aquarium volume or your professional's advice, and follow the product label for the number of capsules and how often to use it. Do not increase the amount or shorten the intervals on your own.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ch3\u003eDirections for Fish Aquariums\u003c\/h3\u003e\n\u003cp\u003eAdd one dissolved 250 mg dose per 10 gallons (38 L) of water. Open the capsule, stir the powder into a cup of aquarium water, then pour it evenly around the hospital tank. Repeat every 24 hours with a partial water change between treatments for 5 to 10 days, and discontinue use if there is no improvement after 5 days. See the chart below for common tank sizes.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ch3\u003eUse in Pet Birds (Under Veterinary Guidance)\u003c\/h3\u003e\n\u003cp\u003eOnly give this treatment to pigeons and other pet birds under the direction of an avian veterinarian. Your vet can advise you on the correct amount for the bird's weight, frequency and duration. Capsule contents may be mixed into soft food or drinking water exactly as instructed.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ch3\u003eMaintain Water Quality \u0026amp; Finish the Treatment\u003c\/h3\u003e\n\u003cp\u003ePerform partial water changes as needed between doses to keep ammonia and nitrite low and ensure good aeration in the hospital tank. Continue treatment for the full recommended number of days even if fish or birds appear better; stopping early can allow symptoms to return. If there is no improvement after several days, or if signs worsen, consult an aquatic or avian professional.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003ctable class=\"fph-dose-table\"\u003e\n\u003ccaption\u003eFix Flex Amounts by Aquarium Size\u003c\/caption\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth scope=\"col\"\u003eTank volume\u003c\/th\u003e\n\u003cth scope=\"col\"\u003eCephalexin per use\u003c\/th\u003e\n\u003cth scope=\"col\"\u003e250 mg capsules\u003c\/th\u003e\n\u003cth scope=\"col\"\u003e500 mg capsules\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e10 gallons (38 L)\u003c\/td\u003e\n\u003ctd\u003e250 mg\u003c\/td\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003ctd\u003en\/a (use 250 mg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e20 gallons (76 L)\u003c\/td\u003e\n\u003ctd\u003e500 mg\u003c\/td\u003e\n\u003ctd\u003e2\u003c\/td\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e30 gallons (114 L)\u003c\/td\u003e\n\u003ctd\u003e750 mg\u003c\/td\u003e\n\u003ctd\u003e3\u003c\/td\u003e\n\u003ctd\u003e1 + one 250 mg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e40 gallons (151 L)\u003c\/td\u003e\n\u003ctd\u003e1000 mg\u003c\/td\u003e\n\u003ctd\u003e4\u003c\/td\u003e\n\u003ctd\u003e2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e55 gallons (208 L)\u003c\/td\u003e\n\u003ctd\u003eabout 1375 mg\u003c\/td\u003e\n\u003ctd\u003e5 to 6\u003c\/td\u003e\n\u003ctd\u003e3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eThese figures follow the Fix Flex product label: add one dissolved 250 mg dose per 10 gallons (38 L) of water, repeat every 24 hours with a partial water change between treatments for 5 to 10 days, and discontinue use if there is no improvement after 5 days. Dose by the water volume of your treatment tank, not by the number of fish, and round to the nearest practical capsule. The bottle label or your aquatic veterinarian takes priority over this quick-reference chart.\u003c\/p\u003e\n\u003ch3\u003eWhat to Expect During Treatment\u003c\/h3\u003e\n\u003cdiv class=\"fph-info-grid\"\u003e\n\u003cdiv class=\"fph-info-card\"\u003e\n\u003ch3\u003eDays 1 to 2\u003c\/h3\u003e\n\u003cp\u003eFish may hide or eat less, and the water can look slightly cloudy. This is normal early on. Keep dosing on schedule and keep aeration strong.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"fph-info-card\"\u003e\n\u003ch3\u003eDays 3 to 5\u003c\/h3\u003e\n\u003cp\u003eLook for signs it is working: sores and red patches stop spreading, appetite starts to return, and breathing steadies. If there is no change by day 5, discontinue use and ask an aquatic veterinarian.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"fph-info-card\"\u003e\n\u003ch3\u003eDays 5 to 10\u003c\/h3\u003e\n\u003cp\u003eEven if the fish are improving, finish the full treatment so the infection does not return. Afterward, run a partial water change and put activated carbon back in to clear any leftover cephalexin.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"fph-info-card\"\u003e\n\u003ch3\u003eWhat You Need for Treatment\u003c\/h3\u003e\n\u003cp\u003eA little setup before the first dose saves trouble later.\u003c\/p\u003e\n\u003cul class=\"fph-symptom-list\"\u003e\n\u003cli\u003eA separate hospital or quarantine tank, so you are not treating the whole display.\u003c\/li\u003e\n\u003cli\u003eA heater and an air stone or sponge filter for steady temperature and strong aeration.\u003c\/li\u003e\n\u003cli\u003eAn ammonia and nitrite test kit to keep tabs on water quality.\u003c\/li\u003e\n\u003cli\u003eA dechlorinator for the water changes between doses.\u003c\/li\u003e\n\u003cli\u003eA small net and a clean cup for gentle transfer and measuring the dose.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cp class=\"fph-tip\"\u003e\u003cstrong\u003ePro Tip:\u003c\/strong\u003e Always quarantine infected fish and birds away from healthy companions during treatment to reduce stress and help prevent the spread of disease. A small, dedicated hospital tank with a heater, air stone and no substrate makes dosing and water changes easier.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails id=\"fph-mechanism\" class=\"fph-acc\"\u003e\n\u003csummary\u003e\n\u003ch2\u003eHow Fix Flex Works\u003c\/h2\u003e\n\u003c\/summary\u003e\n\u003cdiv class=\"fph-acc-body\"\u003e\n\u003cp\u003eFix Flex supplies cephalexin at 250 mg or 500 mg per capsule. It works against a range of Gram-positive bacteria and some Gram-negative species that affect the skin, fins and soft tissue of fish and birds, helping to slow or stop their growth.\u003c\/p\u003e\n\u003cp\u003eEach capsule is a hard gelatin shell that holds the cephalexin powder, along with standard ingredients that hold the capsule together and help the contents disperse evenly when dissolved in aquarium water or mixed with soft food.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails id=\"fph-safety\" class=\"fph-acc fph-acc--warn\"\u003e\n\u003csummary\u003e\n\u003ch2\u003eSafety and Tank Notes\u003c\/h2\u003e\n\u003c\/summary\u003e\n\u003cdiv class=\"fph-acc-body\"\u003e\n\u003cp\u003eWhen used as directed, this product usually causes no problems in ornamental fish and pet birds. As with any antibacterial treatment, incorrect amounts or prolonged use can increase the risk of side effects and bacterial resistance.\u003c\/p\u003e\n\u003cul class=\"fph-card-list\"\u003e\n\u003cli\u003e\n\u003ch3\u003eFish\u003c\/h3\u003e\n\u003cp\u003eThis treatment may cause temporary stress or hiding behavior, mild water cloudiness and reduced appetite during treatment. If fish show severe distress such as rapid gill movement, loss of balance, gasping at the surface or lying on the bottom, stop treatment, improve aeration and seek aquatic veterinary advice.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ch3\u003eBirds\u003c\/h3\u003e\n\u003cp\u003eWhen the treatment is given in food or drinking water, possible reactions include decreased appetite, loose or changed droppings and lethargy, especially if the amount is too high or the bird is sensitive. If your bird appears fluffed up, inactive or stops eating, discontinue use and contact an avian veterinarian.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ch3\u003eInvertebrates\u003c\/h3\u003e\n\u003cp\u003eDo not use this product in display tanks that contain shrimp, snails or other invertebrates, as strong treatments of this kind may harm them or disrupt the tank ecosystem. Whenever possible, move affected fish to a separate hospital tank.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ch3\u003eSafe use in your system\u003c\/h3\u003e\n\u003cp\u003eTreat fish in a hospital or quarantine tank whenever you can, remove activated carbon and turn off UV sterilizers during treatment, and monitor ammonia, nitrite and temperature closely. Do not mix this product with other treatments unless advised by a veterinarian.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ch3\u003eImportant safety warning\u003c\/h3\u003e\n\u003cp\u003eFix Flex is intended for \u003cstrong\u003eornamental aquarium fish and non-food pet birds only\u003c\/strong\u003e. It is \u003cspan class=\"fph-inline-warning\"\u003enot for animals raised for food\u003c\/span\u003e. Store capsules in a cool, dry place away from direct sunlight and keep out of reach of children and pets. Always follow the directions on the label.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails id=\"fph-shipping\" class=\"fph-acc\"\u003e\n\u003csummary\u003e\n\u003ch2\u003eShipping \u0026amp; Returns\u003c\/h2\u003e\n\u003c\/summary\u003e\n\u003cdiv class=\"fph-acc-body\"\u003e\n\u003cdiv class=\"fph-info-grid\"\u003e\n\u003cp class=\"fph-info-card\"\u003e\u003cstrong\u003eShipping Policy:\u003c\/strong\u003e Orders ship from our U.S. warehouse within 1 business day via USPS or UPS, with same-day dispatch on orders placed before 1:30 p.m. CT (Monday through Friday). For full shipping details, please see our \u003ca href=\"https:\/\/finepethealth.com\/policies\/shipping-policy\"\u003eshipping policy\u003c\/a\u003e.\u003c\/p\u003e\n\u003cp class=\"fph-info-card\"\u003e\u003cstrong\u003eRefund Policy:\u003c\/strong\u003e If there is an issue with your order, you may be able to return or exchange items within 30 days according to our store guidelines. Before sending anything back, please review our \u003ca href=\"https:\/\/finepethealth.com\/policies\/refund-policy\"\u003erefund policy\u003c\/a\u003e carefully.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"fph-acc\"\u003e\n\u003csummary\u003e\n\u003ch2\u003eMore Fish \u0026amp; Bird Treatments\u003c\/h2\u003e\n\u003c\/summary\u003e\n\u003cdiv class=\"fph-acc-body\"\u003e\n\u003cdiv class=\"fph-info-grid\"\u003e\n\u003cp class=\"fph-info-card\"\u003e\u003cstrong\u003eFix Zole (Metronidazole) 250\/500mg\u003c\/strong\u003e A treatment for Hexamita, hole-in-the-head disease, and other protozoa-related problems in ornamental fish. Available in 60-count bottles. \u003ca href=\"https:\/\/finepethealth.com\/products\/fish-zole\"\u003eShop Fix Zole\u003c\/a\u003e\u003c\/p\u003e\n\u003cp class=\"fph-info-card\"\u003e\u003cstrong\u003eFix Doxy (Doxycycline) 100mg\u003c\/strong\u003e A treatment for columnaris, respiratory infections, and Mycoplasma in fish and non-food pet birds. Available in 30-count and 60-count tablets. \u003ca href=\"https:\/\/finepethealth.com\/products\/fish-doxy\"\u003eShop Fix Doxy\u003c\/a\u003e\u003c\/p\u003e\n\u003cp class=\"fph-info-card\"\u003e\u003cstrong\u003eFix Zithro (Azithromycin) 250mg\u003c\/strong\u003e A treatment for fin rot, columnaris, gill disease, and avian respiratory concerns in fish and non-food pet birds. Available in 12-count and 30-count tablets. \u003ca href=\"https:\/\/finepethealth.com\/products\/fish-zithro\"\u003eShop Fix Zithro\u003c\/a\u003e\u003c\/p\u003e\n\u003cp class=\"fph-info-card\"\u003e\u003cstrong\u003eFix Cin (Clindamycin) 150mg\u003c\/strong\u003e A treatment for gram-positive bacterial problems, including skin and soft-tissue concerns, in ornamental fish. \u003ca href=\"https:\/\/finepethealth.com\/products\/fish-cin\"\u003eShop Fix Cin\u003c\/a\u003e\u003c\/p\u003e\n\u003cp class=\"fph-info-card\"\u003e\u003cstrong\u003eFix Sulfa (SMZ\/TMP) 960mg\u003c\/strong\u003e A treatment used against a range of bacterial infections in ornamental fish. \u003ca href=\"https:\/\/finepethealth.com\/products\/fish-sulfa\"\u003eShop Fix Sulfa\u003c\/a\u003e\u003c\/p\u003e\n\u003cp class=\"fph-info-card\"\u003e\u003cstrong\u003eFix Pen (Penicillin) 500mg\u003c\/strong\u003e A treatment for gram-positive bacterial problems in ornamental fish and non-food pet birds. \u003ca href=\"https:\/\/finepethealth.com\/products\/fish-pen\"\u003eShop Fix Pen\u003c\/a\u003e\u003c\/p\u003e\n\u003cp class=\"fph-info-card\"\u003e\u003cstrong\u003eFix Mox (Amoxicillin) 250\/500mg\u003c\/strong\u003e A treatment for fin rot, dropsy, ulcers and other bacterial infections in ornamental fish. Available in 30-count and 100-count capsules. \u003ca href=\"https:\/\/finepethealth.com\/products\/fish-mox\"\u003eShop Fix Mox\u003c\/a\u003e\u003c\/p\u003e\n\u003cp class=\"fph-info-card\"\u003e\u003cstrong\u003eFix Flox (Ciprofloxacin) 500mg\u003c\/strong\u003e A treatment for gram-negative bacterial problems, including fin rot, ulcers, columnaris, and septicemia, in ornamental fish and non-food pet birds. \u003ca href=\"https:\/\/finepethealth.com\/products\/fish-flox\"\u003eShop Fix Flox\u003c\/a\u003e\u003c\/p\u003e\n\u003cp class=\"fph-info-card\"\u003e\u003cstrong\u003eBrowse all treatments\u003c\/strong\u003e Explore our complete \u003ca href=\"https:\/\/finepethealth.com\/collections\/fish-bird-antibacterials\" rel=\"noopener\"\u003e\u003cstrong\u003eFish \u0026amp; Bird Antibacterials Collection\u003c\/strong\u003e\u003c\/a\u003e for more Fix line products and related treatments.\u003c\/p\u003e\n\u003cp class=\"fph-info-card\"\u003e\u003cstrong\u003eGuides and treatment tips\u003c\/strong\u003e Visit the \u003ca href=\"https:\/\/finepethealth.com\/blogs\/fish-and-bird-antibacterials\" rel=\"noopener\"\u003e\u003cstrong\u003eFish \u0026amp; Bird Treatments Blog\u003c\/strong\u003e\u003c\/a\u003e for practical usage guides, water-care advice and treatment tips.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003chr\u003e\n\u003csection id=\"fph-faq\" class=\"fph-section\"\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdiv class=\"fph-faq-list\"\u003e\n\u003cdetails class=\"fph-faq-item\"\u003e\n\u003csummary\u003eWhat is fish flex?\u003c\/summary\u003e\n\u003cdiv class=\"fph-faq-answer\"\u003e\n\u003cp\u003eFish flex is a common name for cephalexin sold as an aquarium treatment. Fix Flex is the current version: cephalexin 250 mg and 500 mg capsules for ornamental fish and non-food pet birds. It is used for bacterial problems like fin and tail rot, skin ulcers, red patches, and infected wounds, not fungi, viruses, or parasites such as ich and flukes.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"fph-faq-item\"\u003e\n\u003csummary\u003eWhat is fish cephalexin?\u003c\/summary\u003e\n\u003cdiv class=\"fph-faq-answer\"\u003e\n\u003cp\u003eFish cephalexin is a common name for cephalexin sold as an aquarium treatment. Fix Flex (sometimes typed fixflex) is the current version: fish cephalexin 500mg and 250mg capsules for ornamental fish and non-food pet birds. It treats bacterial problems like fin and tail rot, skin ulcers, red patches and dropsy, not fungi, viruses or parasites.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"fph-faq-item\"\u003e\n\u003csummary\u003eIs Fish Flex the same as fish cephalexin 500mg?\u003c\/summary\u003e\n\u003cdiv class=\"fph-faq-answer\"\u003e\n\u003cp\u003eYes. Fish Flex was the older brand name, and it contains cephalexin, so fish cephalexin 500mg describes the same product. Fix Flex from Aqua Soma Labs supplies it in 250 mg and 500 mg capsules for ornamental fish and non-food pet birds.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"fph-faq-item\"\u003e\n\u003csummary\u003eIs Fix Flex the same as Fish Flex or Aqua Ceph?\u003c\/summary\u003e\n\u003cdiv class=\"fph-faq-answer\"\u003e\n\u003cp\u003eIt is the same idea under a current label. Fish Flex, Fish Flex Forte, Aqua Ceph, Aqua Flex, and FISHBIOTIC Cephalexin were earlier cephalexin products for aquarium use, and Fix Flex carries the same cephalexin for the same problems. Follow the Fix Flex label for the amount and duration.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"fph-faq-item\"\u003e\n\u003csummary\u003eWhat is the difference between Fish Flex and Fish Flex Forte?\u003c\/summary\u003e\n\u003cdiv class=\"fph-faq-answer\"\u003e\n\u003cp\u003eIt comes down to strength. The original \u003cstrong\u003eThomas Labs Fish Flex\u003c\/strong\u003e was 250 mg per capsule, while \u003cstrong\u003eFish Flex Forte\u003c\/strong\u003e was 500 mg. \u003cstrong\u003eFix Flex\u003c\/strong\u003e covers both: choose the \u003cstrong\u003e250mg\u003c\/strong\u003e option for the standard strength, or the \u003cstrong\u003e500mg\u003c\/strong\u003e option for the Forte equivalent. The cephalexin and capsule format are the same either way.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"fph-faq-item\"\u003e\n\u003csummary\u003eWhat is the fish cephalexin 500mg dosage?\u003c\/summary\u003e\n\u003cdiv class=\"fph-faq-answer\"\u003e\n\u003cp\u003eThe fish cephalexin 500mg dosage guide is one 500 mg capsule per 20 gallons (76 L) of tank water, dosed every 24 hours for 5 to 10 days, with a partial water change between doses. For the 250 mg strength, use one capsule per 10 gallons (38 L). Discontinue use if there is no improvement after 5 days, and follow the bottle label or your aquatic veterinarian.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"fph-faq-item\"\u003e\n\u003csummary\u003eWhat is Fix Flex (Fish Flex) used for?\u003c\/summary\u003e\n\u003cdiv class=\"fph-faq-answer\"\u003e\n\u003cp\u003eFix Flex (cephalexin 250\/500 mg) is an antibacterial treatment used by hobbyists to help manage bacterial problems such as fin and tail rot, skin ulcers, infected wounds, red patches and pop-eye in ornamental aquarium fish, and to support veterinarian-directed treatment of conditions like bumblefoot, skin infections or joint infections in pet birds.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"fph-faq-item\"\u003e\n\u003csummary\u003eCan you still buy fish flex, or is it discontinued?\u003c\/summary\u003e\n\u003cdiv class=\"fph-faq-answer\"\u003e\n\u003cp\u003eYou can still buy it. The original Thomas Labs Fish Flex and Fish Flex Forte lines were discontinued, but Fix Flex from Aqua Soma Labs is the current fish flex and is in stock in 250 mg and 500 mg strengths, in bottles of 30 or 100 capsules.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"fph-faq-item\"\u003e\n\u003csummary\u003eWhere can I buy cephalexin for fish? Do Walmart or PetSmart sell it?\u003c\/summary\u003e\n\u003cdiv class=\"fph-faq-answer\"\u003e\n\u003cp\u003eYou can order Fix Flex, the current fish cephalexin, directly from Fine Pet Health. General retailers such as Walmart, PetSmart, Petco, and Tractor Supply do not carry the Aqua Soma Labs line, so a dedicated online supplier is the reliable route. Orders ship from our U.S. warehouse with same-day dispatch on orders placed before 1:30 p.m. CT, Monday through Friday, via USPS or UPS.\u003c\/p\u003e\n\u003ca class=\"fph-faq-link\" href=\"https:\/\/finepethealth.com\/collections\/fish-bird-antibacterials\" rel=\"noopener\"\u003eBrowse Fish \u0026amp; Bird Treatments Collection →\u003c\/a\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"fph-faq-item\"\u003e\n\u003csummary\u003eCan fish flex be used for dogs or cats?\u003c\/summary\u003e\n\u003cdiv class=\"fph-faq-answer\"\u003e\n\u003cp\u003eNo. \u003cstrong\u003eFix Flex is for aquarium fish and non-food pet birds only.\u003c\/strong\u003e It must not be used for dogs, cats or other mammals. If you suspect an infection in another animal, contact a veterinary professional instead of using fish treatments.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003chr\u003e\n\u003c\/div\u003e","brand":"Aqua Soma Labs","offers":[{"title":"250-mg (30 Count)","offer_id":50744370495727,"sku":"838004","price":19.95,"currency_code":"USD","in_stock":true},{"title":"250-mg (100 Count)","offer_id":50744370528495,"sku":"793274","price":34.99,"currency_code":"USD","in_stock":true},{"title":"500-mg (30 Count)","offer_id":50744370561263,"sku":"428814","price":24.8,"currency_code":"USD","in_stock":true},{"title":"500-mg (100 Count)","offer_id":50744370594031,"sku":"026784","price":49.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0838\/2296\/9071\/files\/Fish-flex-cephalexin-250mg-30-count-fish-antibacterial..webp?v=1789229494","url":"https:\/\/myfishmox.com\/products\/fish-flex","provider":"My Fish Mox","version":"1.0","type":"link"}