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🐠 Keep your aquarium thriving—because your fish deserve the best care!
API MELAFIX is a 16-ounce liquid antibacterial remedy designed to heal bacterial infections and damaged fins in freshwater fish. Featuring natural tea tree extract, it treats infections within 7 days and prevents disease in new fish with a 3-day regimen. Safe for aquarium ecosystems, it maintains water clarity and pH balance while promoting rapid tissue repair. Trusted by aquarists for over 50 years, MELAFIX ensures healthier, happier fish and a vibrant tank environment.



















| ASIN | B0002567T6 |
| Allergen Information | Apple Free |
| Best Sellers Rank | #3,094 in Pet Supplies ( See Top 100 in Pet Supplies ) #21 in Aquarium Water Treatments |
| Brand | API |
| Brand Name | API |
| Customer Reviews | 4.5 out of 5 stars 15,281 Reviews |
| Global Trade Identification Number | 00317163100110 |
| Included Components | API MELAFIX Freshwater Fish Bacterial Infection Remedy 16-Ounce Bottle |
| Item Form | Liquid |
| Item Type Name | Aquarium Antibacterial Remedy |
| Item Weight | 454 g |
| Liquid Volume | 16 fluid ounces |
| Manufacturer | Mars Fishcare |
| Manufacturer Part Number | 11J |
| Model Number | 11J |
| Number of Packs | 1 |
| Pet Type | Fish |
| Target Species | Fish |
| UPC | 317163100110 |
| Unit Count | 16 Ounce |
A**R
Saved My Fish
I bought my granddaughter a fish, along with one for me. A few days later, her fish appeared to be peeling. Then two of my fish died and one was on its way out. My husband suggested an antibiotic (not this one) so I looked here and found this API MELAFIX one and ordered it. Her fish died before I got it. Then I had another fish getting sick so I put it in the quarantine tank with the other one. Next day I got this and started using it right away. My fish are back to being healthy and happy. I wish I would have found this sooner. It's a life saver, literally.
C**A
Highly recommend works like magic
This stuff is amazing, my fish was very sick and I gave him this as needed and he looks better than the day I got him I would highly recommend it I would also recommend a little mirror if your fishes fin is still having trouble growing back
A**S
Saved my fish!
I got a poor little Betta fish from a chain pet store (probably my first mistake) and I was so excited because he was tri-colored and had a beautiful teal look to him! And he was what I was looking for 'red/white/blue' I was so excited! Well he got put into his new tank, and he didn't seem to be moving around much, even for a betta which I have owned in the past. I started taking a closer look at him about a month after I got him, and he looked to have fin rot. He had been biting his tail in the tiny cup which is hard to see in the photos... So I got this neat stuff because it's less than half of betta fix, is the same active ingredient, and has a higher concentration. Win, win, win. Started using it in his tank on a regular, adding one drop per gallon with an eye dropper and doing regular water changes. And would you know it, he started changing colors! Now I'm not saying that this stuff will make your fish morph like it did mine, but it will save them if you use it as instructed for what it is meant to be used for. What I didn't know at the time of buying him is that he had a SEVERE bacterial infection all over his face and sides. That white I thought was part of his color WAS HIM BEING EATEN ALIVE BY THIS BACTERIA. This medication is designed to get rid of that bacteria, which is what causes fin rot as well. After using it for about 3 months on a regular I had a completely different fish, literally. He was so much happier and looked even more vibrant and had much more energy to inspect and even flair at my camera and show of his beautiful colors. Long story short, if you use this, USE IT FOR WHAT ITS MEANT TO BE USED FOR AND YOU'LL GET GREAT RESULTS. I know I did. I still have little ATO to this day (I've had him for about two years now) and he now has an entourage of shrimp palls to keep him company. In the picture provided you can still see some of the bacteria on his face around his eyes, that's long gone at this point but I couldn't get a good picture for him from today. Little bugger keeps teasing me and then swimming away, ah well. These ones will be good enough.
A**E
Low dose tea tree oil?
I’m like 70% sure this is just tea tree oil, but even so it works for fungi and helped clear up my beta’s fin rot.
M**I
Great
Easy and safe to use, I bought it to treat my betta fish got injuried with white Pimple on the skin it was small and got bigger and bigger, I tryed the methanol blue and salt but it didnxt work, after using the Melafix for 5 days it started healing and getting better. The price was a way cheaper than the pet store.
R**M
This stuff is Magick
This stuff is magick... I have a betta that I've had since the baby and I'm very bonded to. He started staying on the bottom a lot and I noticed he had something on his eye I had different water treatment here so I started that so for two weeks he stayed on the bottom... Everyday I kept thinking he was not going to be alive I didn't know how else to help him it was very stressful. I think the other product maybe kept him stable but did not do what I needed. So I went looking for something different I found this. And OMG fourth day and my betta is swimming again... After 2 2 1/2 weeks on the bottom.. thinking he was dying he is now full of life and swimming after treating the water with this. I was so surprised today to see him off of the bottom that I couldn't believe my eyes literally a miracle.. We still have a ways to go but it looks hopeful...I'm so thankful this saved his life
M**N
Didnt heal my fish
I ordered this item thinking that it would heal my Betta fishes fin rot. Now, im not saying the product is bad by any means because it definitely prevented it from getting any worse. I would get this if your more trying to stabilize whatever your fish has going on. But it will NOT heal it. If your looking to actually heal a problem with your fish try KanaPlex. This picture shows my Betta Fishes tail after 14 days of MELAFIX (with 30% water change in between the 7 day mark following products instructions)
P**O
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.
A**O
Creo que cumple su función
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
S**A
Ottimo prodotto
OrdinatO di nuovo
U**V
Perfect ! Just buy it and see the magic
I am a veteran in this hobby so this review would definitely help you in saving your fish from critical condition (whenever you read ) . I recently set up a 75g cichlid community tank . After a few days I observed two of my Oscars had white spots and two parrots were having swim bladder. I had given up on my fishes after raising temperature,feeding green peas and adding salt to the tank .I had read alot about this product and decided to give it a try . After adding this continuously for two days I saw instant changes in my tank . Though one of my parrot died but I was able to save all of them . Though costly I merged it with api pimafix and saved my fished . Now I have 7 Oscars 4 parrots 2 gt all happily set up . Kudos Amazon and api
A**Z
Five Stars
fonctionne très bien, mon poisson rouge avait les yeux blancs, et ça l'a guérit
E**.
Love this ❤️
Been using this for my aquarium 👍🏼
Trustpilot
2 days ago
1 month ago