Search  for anything...
API

API PIMAFIX Antifungal Freshwater and Saltwater Fish Remedy 16-Ounce Bottle

  • Based on 8,231 reviews
Condition: New
Checking for the best price...
$12.08 Why this price?

Buy Now, Pay Later

As low as $3 / mo
  • – 4-month term
  • – No impact on credit to apply
  • – Instant approval decision
  • – Secure and straightforward checkout

Ready to go? Add this product to your cart and select a plan during checkout.

Payment plans are offered through our trusted finance partners Klarna, Affirm, Afterpay, Zip, Apple Pay, and Google Pay. No-credit-needed leasing options through Acima may also be available at checkout.

Learn more about financing & leasing here.

Selected Option

Free shipping on this product

FREE 30-day refund/replacement

To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

Availability: In Stock.
Fulfilled by Amazon
Arrives Monday, Aug 24
Order within 11 hours and 57 minutes
Available payment plans shown during checkout
Protection Plan Protect Your Purchase
Checking for protection plans...

Recently Viewed

Size: 16-Ounce


Features

  • Contains one (1) API PIMAFIX Antifungal Freshwater and Saltwater Fish Remedy 16-Ounce Bottle
  • Rapidly and safely treats fungal infections on body and fins of fish
  • Contains all-natural extract from West Indian Bay Trees to help with fungus and cottony growth
  • Helps heal internal and external bacterial infections in freshwater, saltwater and reef aquariums
  • Use daily for a week when treating infections

Description

API PIMAFIX Antifungal Freshwater and Saltwater Fish Remedy treats fungal and bacterial infections in all fish, including even the most delicate fish species such as tetras, discus fry, and scaleless fish like clown loaches. API PIMAFIX Antifungal Treatment alleviates symptoms such as fungus or cottony growth on fins, mouth and body fungus, and reddening of fins and body. API PIMAFIX Antifungal Treatment is safe for use in reef aquariums and will not harm the biological filter or invertebrates, such as live corals and anemones. Use dosing cap on bottle to treat effectively, using 5 ml per 10 US gallons of aquarium water. Follow directions on product label. To treat a broader range of infections, use with API MELAFIX Antibacterial Fish Treatment. API PIMAFIX Antifungal Treatment can be used with all API products, including medications and water conditioners. With API aquarium products, it’s easy to keep a beautiful saltwater, freshwater or reef aquarium. For almost 60 years API has developed premium solutions with proven and effective results for your family and ours. API offers a range of testing kits, water conditioners, and nutritionally superior food, because we’re dedicated to making a better underwater world. They work to provide a safe, hospitable environment for fish such as tropical community fish, cichlids, goldfish and more. At API, we understand the rewards and relaxation of fishkeeping because we have a passion for fish too.

Brand: API


Liquid Volume: 16 fluid ounces


Item Weight: 8 ounces


Item Form: Liquid


Number of Packs: 1


Product Dimensions ‏ : ‎ 2.76 x 2.76 x 8.66 inches; 8 ounces


Item model number ‏ : ‎ 10J


Department ‏ : ‎ Unisex-Adult


Date First Available ‏ : ‎ June 15, 2004


Manufacturer ‏ : ‎ Mars Fishcare


Best Sellers Rank: #7,786 in Pet Supplies (See Top 100 in Pet Supplies) #50 in Aquarium Water Treatments


#50 in Aquarium Water Treatments:


Customer Reviews: 4.5 4.5 out of 5 stars (8,231)


Brand Name: API


Number of Packs: 1


Unit Count: 1 Count


Manufacturer: Mars Fishcare


UPC: 317163100103


Number of Items: 1


Global Trade Identification Number: 03


Item Type Name: Aquarium Antifungal Remedy


Model Number: 10J


Manufacturer Part Number: 10J


Liquid Volume: 16 fluid ounces


Item Weight: 8 ounces


Item Form: Liquid


Pet Type: Fish


Target Species: Fish


Allergen Information: Apple Free


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Monday, Aug 24

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • Zip Pay in 4
  • Financing through Apple Pay
  • Financing through Google Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Similar Products

Top Amazon Reviews

    • works great
Size: 16-Ounce
I can't say enough about this product. I bought some fish with problems; they all died. I was able to save the fish I had left and defungate the tank before the fish I had bought earlier came . A real lifesaver
Reviewed in the United States on August 16, 2026 by Amazon Customer
    • Great but has some issues!
Size: 16-Ounce
This did cure my betta from his fin riot, but i do have some issues that I ran into when I was treating my betta with this remedy. Fist, my mystery Snails got sick. One of them started to float around on the top of my tank which he never done before, and my seconded snail stopped moving for 8 hours. Once I removed them from my tank into a little setup for them, they started to move around quickly, and they were fine. Secondly, some of my plants got brown/black spots all over them and they started to drop most of their leaves (I wasn't to concerned about this). My last issue is that my tank got extremely dirty, which I did clean my tank right before I added the PIMAFIX. I recommend that you make a little setup separate from your original tank if you have more than one fish, or you have little friends in the tank. ... show more
Reviewed in the United States on September 15, 2022 by Allena
    • Saved my Denison Barb - miraculous product.
Size: 16-Ounce
This product worked miracles. I have a 140 gallon freshwater community tank that has 3 Denison barbs (aka roseline sharks) among current residents. I’ve had them for a few years and they have gotten quite large (~5”). Recently, out of nowhere, one of them developed white patches on their dorsal side that continued to grow. He began swimming very weirdly, almost standing vertically in one place the entire day. I had lost another one like this a few years back and the local fish store thought it was a bacterial infection and had me treat the tank with some white powdery stuff. It did not work and I lost that one. This patch on this little guy kept getting bigger until it looked like he had a cotton ball on his back, I was really despairing and thought I was going to lose him. Went online and found that the cottony growth was probably a fungal infection, which led me to this product. Raced out to the local store and bought the last bottle they had in stock. Put it in the tank the same day after removing the carbon from my sump. It was truly miraculous that after only 1-2 days of treatment, he started improving, The large external fungal growth began separating from his dorsal side and completely fell off in another day, exposing the damage the fungus had caused. He began swimming much more normally and rejoined his 2 schooling mates as they darted about the tank. Also noticed he began eating again. I continued dosing for a week and then did a 25% water change. He was still not fully healed, his external scales had not grown back, so I have continued dosing for another week and will do a second water change. He continues to heal and is almost back to normal appearance and behavior again. I am so thankful for this product and how well it has worked for my fish. Can’t recommend it highly enough and plan on keeping some in stock. ... show more
Reviewed in the United States on May 6, 2022 by jaswartz
    • i guess it works
Size: 8 oz
Review Image by Tesla
Review Image by Tesla
Review Image by Tesla
I have had limited success with this product. In more than 1/2 the cases the fish heal but maybe they would on their own? Not sure but I have a soft spot in my heart for struggling Bettas in pet stores. Those poor fish living in tiny cup all alone make me sad. So many die and are never homed. I built a large tank for Betta sorority and after quarantine add newbies to my tank. Females aren't as flamboyantly finned out as males so they don't get homes as often. I happen to love them, even the sickly runts I often buy get a fair to better chance at great life with my other gals :) ... show more
Reviewed in the United States on January 1, 2025 by Tesla
    • I did notice that he loved to puck on corners and squeeze behind the sponge ...
Size: 16-Ounce
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 using it with the API Melafix 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. ... show more
Reviewed in the United States on October 21, 2017 by Pao
    • As described
Size: 16-Ounce
I love this stuff for my fish tank. Especially the first cleaning after adding a new fish.
Reviewed in the United States on July 22, 2026 by Meghan K.
    • For Certain Things This Is A Great First Defense (IN DEPTH REVIEW)
Size: 16-Ounce
(WARNING- This is an in depth review of this aquarium product. This review is to help those seriously interested in purchase make an informed buying decision. For a brief summary, see section marked THE BOTTOM LINE) ------------------- I have been keeping fish for quite a few years now. I have a variety of tanks and fish. When it comes to a first defense, I want something natural and that is not going to strip my tank filters of beneficial bacteria. Let's see how Pimafix measures up. WHAT IS PIMAFIX LIKE? Pimafix is a natural extract of a plant in the myrtle family also known as West Indian Bay tree. It is a weak extract which helps nudge the water into a more healthy environment for the fish in certain instances. This comes in a bottle with a measuring cap on top. You use 5ml for every 10 gallons of water, and use daily for seven days, followed by at least 25% water change. The smell is a bit herby and the appearance is clear. WHAT DOES THIS TREAT? This is used primarily for fungal conditions such as fungus growths, mouth and body fungus, and even reddening of the fins and body- but not the kind that is sores- that is better addressed by APIs other product called Melafix which is derived from tea tree. HOW DOES THIS PERFORM? This performs well when used for cottony looking fungal growth. I had a fish with a small patch of cottony growth on a top fin. After a week of use of Pimafix, the growth has gone down by half and none of the other fish have shown signs of it. DOES THIS AFFECT THE FILTER? This does not throw off the biological filter of the tank if used as recommended with water changes every 5 to 7 days. ANY UNUSUAL THINGS? This does create a tremendous foam in a tank so don't panic if that happens to you. It is normal and will go away eventually. SENSITIVITIES I HIGHLY recommend that when you start using Pimafix that you use a smaller dose at first to test for any fish sensitivities. I have used this in all of my freshwater tanks, usually with no problem, including snails and shrimp. HOWEVER, I have had occasional fish which have personal allergic reactions or difficulties with Pimafix or Melafix. It is important that you either remove the sick fish into a hospital tank that you can isolate treatment and observation or at least start with smaller doses to test and see if any fish are allergic. THE BOTTOM LINE For fungal conditions, if you use Pimafix as a first defense, it will help reduce and often reverse cottony looking fungal conditions and general body or fin reddening. For more serious conditions, something a bit more intense might be required. MY RATING I really love Pimafix. It works well if you catch things early in your tanks, and often can go hand in hand with Melafix, depending on your fish. ... show more
Reviewed in the United States on October 3, 2018 by Colorgirl
    • Works good to remove ick!
Size: 8 oz
We had noticed a but of ick, fungus film like started appearing our tank and on a couple of the fish as well as our turtle, after reading a few different products we decided to try this one. It is working wonderfully. You could see the ick melting away from the turtle on day 1. We had turned off the filter when we put it in and let it sit for a bit, it made the water a little cloudy, but once we turned the filter back on that was all gone. I believe it was just this doing the job of cleansing the water that made it cloudy. Few days in and everything is gone and looking much better. Water is clear and all the fish/turtle are happy. Theres a very mild scent but it is not strong. ... show more
Reviewed in the United States on April 22, 2026 by Stacie

Can't find a product?

Find it on Amazon first, then paste the link below.
Checking for best price...