API MELAFIX Freshwater Fish Bacterial Infection Remedy 8-Ounce Bottle
Original price was: $14.78.$10.18Current price is: $10.18.






Price: $14.78 - $10.18
(as of Oct 11, 2025 11:00:24 UTC – Details)
API MELAFIX Freshwater Fish Bacterial Infection Remedy soothes the transition from store to home by reducing the risk of your fish developing a disease. The fish you bought may already carry a disease. Disease is often difficult to detect, particularly in its early stages. Treat bacterial infections in your fish and reduce the risk of spreading illness to other fish with API MELAFIX Freshwater Fish Bacterial Infection Remedy. Bacterial diseases are caused mostly by dirty aquarium conditions and the addition of infected fish. Fish that are injured and have open wounds are especially susceptible, even in seemingly clean tanks. Bacterial infections, like fin and tail rot, eye cloud, pop eye, body slime and mouth fungus destroy tissue and other organs, and if left untreated, can cause death. API MELAFIX Freshwater Fish Bacterial Infection Remedy is an all-natural antibacterial treatment that heals open wounds, treats bacterial infections and promotes re-growth of damaged fins and tissue, usually within a week. Just add 5 ml per 10 gallons of aquarium water. It will not adversely affect the biological filter, alter the pH or discolor the water. For effective treatment, dose infected fish daily for 7 days, and continue afterward if necessary. Dose new fish daily for 3 days. Remove activated carbon from filter before use, if possible. With API Aquarium products, it’s easy to keep a beautiful saltwater, freshwater or reef aquarium. For over 50 years, API has been creating innovative, research-driven solutions that make it easier to care for your fish and aquarium. API Aquarium Treatment Supplies are designed to work in conjunction with each other to provide best results to control algae, promote healthy bacterial growth and help control and cure fish diseases and conditions such as ich and fin rot. They work to provide a safe, hospitable environment for fish such as tropical community fish, cichlids, goldfish and more. With API, you can spend more time admiring your fish, and less time scrubbing your tank. Make sure to use all products as directed in order to ensure the best results.
Is Discontinued By Manufacturer : No
Product Dimensions : 5 x 2 x 12 inches; 9.6 ounces
Manufacturer recommended age : 1 month and up
Item model number : 11H
Department : Medication
Date First Available : June 20, 2004
Manufacturer : Mars Fishcare
ASIN : B0002567SW
Best Sellers Rank: #25,852 in Pet Supplies (See Top 100 in Pet Supplies) #207 in Aquarium Water Treatments
Customer Reviews: 4.4 4.4 out of 5 stars 5,296 ratings var dpAcrHasRegisteredArcLinkClickAction; P.when(‘A’, ‘ready’).execute(function(A) { if (dpAcrHasRegisteredArcLinkClickAction !== true) { dpAcrHasRegisteredArcLinkClickAction = true; A.declarative( ‘acrLink-click-metrics’, ‘click’, { “allowLinkDefault”: true }, function (event) { if (window.ue) { ue.count(“acrLinkClickCount”, (ue.count(“acrLinkClickCount”) || 0) + 1); } } ); } }); P.when(‘A’, ‘cf’).execute(function(A) { A.declarative(‘acrStarsLink-click-metrics’, ‘click’, { “allowLinkDefault” : true }, function(event){ if(window.ue) { ue.count(“acrStarsLinkWithPopoverClickCount”, (ue.count(“acrStarsLinkWithPopoverClickCount”) || 0) + 1); } }); });
Contains one (1) API MELAFIX Freshwater Fish Bacterial Infection Remedy 8-Ounce Bottle
Heals bacterial infections and repairs damaged fins, ulcers and open wounds
Contains natural, botanical tea tree extract to quickly and rapidly help fish
Helps treat newly-introduced fish to reduce risk of disease outbreak in freshwater aquariums
Use daily for a week when treating infections and for 3 days as a preventive when adding new fish
Customers say
Customers find the water treatment effective for healing sick fish and appreciate its quality, considering it a great value for money. The product receives mixed feedback regarding water clarity, with some reporting it doesn’t cloud the water while others note it becomes murky. Customers disagree on the smell, with some finding it pleasant while others describe it as odd. There are concerns about fish death, with some customers reporting their fish died within a week of use. The product’s seal is problematic, with multiple customers noting that the seal was not intact.
13 reviews for API MELAFIX Freshwater Fish Bacterial Infection Remedy 8-Ounce Bottle
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Original price was: $14.78.$10.18Current price is: $10.18.
Kirk schmitz –
Aquarium must have
This stuff works great for healing sick fish, it doesn’t change the water color and has a nice smell too. I had great results!
Jessica Eason –
Saved my Black Moor Goldfish!
My black moor goldfish accidentally got stuck in the siphon when my son was cleaning the tank and it damaged his eye. I put him in a nursing tank and added the Melafix and within 4 days his eye was completely healed. Amazing product!! The water did turn cloudy and murky with the medicine in it but I just monitored the water with test strips and as long as it was good then I continued the treatment.
Pao –
I did notice that he loved to puck on corners and squeeze behind the sponge …
This product really worked as described! I am a newbie fish owner, so I have very little experience taking care of my goldfish. However, I noticed that he had some scales fallen out after having him for less than 1 month. I didn’t know how he had a few of his scales fallen out since he was in a 30 gallon tank. I have few ornaments in the tank, and there weren’t any sharp objects as well. I did notice that he loved to puck on corners and squeeze behind the sponge a lot, so I assumed it may have been from that. So, I went online and started reading up on how to take care of my goldfish and how to help him grow back his scales or prevent more from falling. At this time, I also wasn’t sure if he had other diseases as well since this was my first time taking care of a fish. So, I saw and read several reviews on this product where previous customers and experienced fish owners wrote about it helping their fish, as well as, preventing diseases and other ailments. I thought I gave this item a try. It was one of the best products I’ve bought for my fish. It really helped him healed his scales. I noticed the area where his scales were missing darkened and turned fleshy again. In about 1 week or so, I noticed the area started growing scales already. I am very happy with this item. However, this product is very strong. I have a small, young goldfish in a 30 gallon freshwater tank, with a 50 gallon Aquaclear water filter system, and following the dosages for this product for a 30 gallon tank, I noticed my goldfish acted very agitated to this product. His eyes also started bulging out more. After observing this, I did 25% water change and used half the given dosage. I think this amount was more tolerable to my baby goldfish. I also noticed that my fish scales and fins became silkier after a week of usage. I’m really happy I tried this product out. I would recommend a lower dosage if you have smaller fish. I also recommend to do at least 2 days 25% water change every time you use the product.
AP –
Works but is very potent, use sparingly!
I have used melafix for years with good results. I give it 4 stars instead of 5 due to the horrid instructions. If you follow the instructions as written they will have you massively overdosing your aquarium with the stuff. My advice is dose it ONE time then wait 7 days do water change etc. Even a half dose would probably work ok.
Fi –
Saved my little dude
My betta fish is dramatic (this is a joke, love my little dude) and elected to be fine one moment then have crazy fin rot / nipping at his fins a few hours later, this fixed him up right away! My little guy is now happy as can be, and fins are doing great! It was easy to use, and itâs a good sized container! Unlike the small overpriced ones in stores, this will actually last an entire medicine cycle. Even more than one! Itâs not very cloudy. You can see its difference in the water but it disperses quickly. Very safe. It helped him a lot heâs in much better health! Bottle looks secure and was packed well.
igor –
API MELAFIX
Three stars because the bottles didn’t have a thermos-sealed cap. This suggests the medicine may have been bottled in a basement, not a factory, and is not of the expected quality. Be careful when ordering!
PublicName –
This Really works!
Have you ever witnessed the ping-pong ball drop into the fish bowl and your son or daughters eyes light up like vegas slot machine? 3 years ago those lights were beaming from my kids eyes as mine were rolling back. “Mr. Bubbles we’ll call him Dad” as I smiled through gritting teeth while thoughts of accidentally dropping the bowl in the parking lot danced in my head. While on the ride home I was reminiscing on all of the bad luck pets have had under our care and came up with a brilliant idea to tell my kid. “Honey, I know you love Mr Bubbles, but just know that these little fish only live a couple weeks” (I was hoping I could keep it alive at least that long) Three years and $200 later after 2 tank upgrades, pumps, filters, gravel, plants, log and all of the water conditioning chemicals Mr. Bubbles has survived. (After 3 months my kid changed the name to Miracle as it had far surpassed the life span I had given it. )About a month ago, Miracle was hanging out on the bottom of the tank, not moving to much. After a few days of him being lethargic, we noticed some white gunk on his gills and his fins were not looking good. I googled and thought I found the answer in “Ick” after that did not work and Miracle’s condition worsened, I researched some more and found fin rot as the culprit. By this time, Miracle was just laying on the bottom of the tank mostly on his side, eyes clouded overâ¦. not good. Day one after putting the Melafix in the tank, he started swimming again, By day two he looked to be swimming even better, within a week, He is like a new fish again! No more cloudy eyes, strong swimming and appetite is back. This stuff really works! Highly recommend it!
Mandy –
Works as expected!
Works as expected!
Alberto –
Parece que el tratamiento es efectivo, no soy veterinario y si mueren mis peces puede ser por otros agentes o causas.En cualquier caso tener este producto y aplicarlo a mis peces me da una tranquilidad
stefania –
OrdinatO di nuovo
Client d’Amazon –
livraison bien arrivée
AbjEd –
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Harsha V. –
Very nice, healed my fishes which were completely hurt in under 10 days! My fish tank glass had literally exploded and all the fish,shrimp were on the ground and hurt especially the fishes which were completely hurt and put in a cold water bucket for over 12 hours waiting for the new aquarium to arrive at my house… This saved my fishes, I’ve heard from many people if over dosed then the fishes die very quick, glad I gave my fish the right amount of dose! Recommended for iridescent catfish shark