API Furan-2 Freshwater Aquarium Fish Medication
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Quickly and effectively treat a wide variety of bacterial diseases with API Furan-2 Powder for Bacterial Disease for Fish. Most bacterial diseases are caused by dirty aquarium conditions, but there are smaller groups of bacteria that can infect fish in otherwise good aquarium conditions. And they can be difficult to diagnose. Symptoms, like listlessness, weakened or abnormal swimming, dark blotches and loss of appetite, are similar across the spectrum. Left untreated, they can cause damage to internal organs and even death. API Furan-2 Powder for Bacterial Disease for Fish treats a broad spectrum of bacterial diseases, usually in 48 hours. It contains two furan compounds, effective antimicrobials that combat gill disease, mouth fungus, furunculosis, black molly disease, fin and tail rot and dropsy. Simply remove the carbon or filter cartridge and add manufacturer's recommended amount directly to the water.
Key Benefits- Contains two furan compounds to combat a broad spectrum of bacterial diseases in 48 hours.
- Treats gill disease, mouth fungus, furunculosis, black molly disease, fin and tail rot and dropsy.
- Made available in 2 sizes to suit tanks of multiple sizes.
- Can be used in both fresh and saltwater aquariums.
- Simply remove the carbon or filter cartridge and add manufacturer's recommended amount directly to the water.
Note: This medication will harm the biological filter. This medication will cause a slight discoloration of water which can be removed with activated carbon.
Medicating an aquarium with antibiotics may suppress the biological filter. Add live bacteria such as API QUICK START to strenghten the biological filter. This medication will cause a slight discoloration of water which can be removed with activated carbon.
California Residents: View Proposition 65 WARNING
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Item Number94447
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Aquarium TypeFreshwater, Saltwater
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Fish TypeTropical Freshwater, Marine Fish, Betta, Goldfish, Marine Invertebrate, Bottom Feeder, Cichlid
For best results, remove activated carbon or filter cartridge from filter and continue aerations. For each 10 gallons (38 L) of water, empty one packet directly into aquarium. Repeat dose after 24 hours. Wait another 24 hours then change 25.0% of the aquarium water. Repeat this treatment for a second time, for a total of 4 doses. Then make a final 25.0% water change and add fresh activated carbon or replace filter cartridge. Treatment may be repeated if necessary.
When should I use API FURAN-2?
Use API FURAN-2 when you suspect your fish is sick with a bacterial infection, symptoms of which include weakened or abnormal swimming, dark blotches on the body, and loss of appetite. If these symptoms are left untreated, they can cause damage to internal organs and even result in fish loss, so it is important to act quickly if you believe your fish is infected. Dose accordingly with API FURAN-2 for highly effective results.
Can API FURAN-2 be used/combined with other treatments for faster results?
API FURAN-2 works quickly and effectively on its own; however, some great products to use in combination with it are API AQUARIUM SALT and API STRESS COAT, both of which promote healing and boost fish immune systems. If your fish appears to be suffering from more than a simple bacterial infection, you may use another medication in conjunction with it safely – as long as you are able to follow the directions for both during treatment. We would not recommend using more than two medications at a time unless you are certain of the diagnosis of multiple ailments, so that you can tell which medications are working or not working while troubleshooting a stubborn disease issue.
Should I remove my filtration media before dosing with API FURAN-2?
Products that are designed to remove things from your aquarium, such as filter media, will also remove dosed medication from your tank. For best results from medication, remove your filtration media as you dose.

Fish Care Made Easier
API is a name you can trust when it comes to taking care of fish. Not only are they passionate about fishkeeping, but they're dedicated to improving the hobby and making it easier to maintain the ideal aquatic environment. From helping the novice set up a new tank to providing state-of-the-art filters for advanced systems, you can rely on API's dedication to quality.


Maintain the Perfect Setup
Fishkeeping is a much easier task with API, because they've taken all the guesswork out of setting up a tank and maintaining it. Their proven treatments include water conditioners and clarifiers, fish medications, pH adjusters, algaecides and quick-start solutions—all designed to keep your aquarium crystal clear and your fish happy and healthy.
Testing Is Key
Once you've started a new aquarium, the only way to keep it in perfect balance is with routine water testing. API gives you all the tools you need to create a nurturing environment for both fish and live plants. Their comprehensive Master Test Kits are tailored to freshwater, saltwater or reef environments, and individual tests for things like pH, ammonia or nitrites leave nothing up to chance.


Clearing the Water
API offers reliable three-step filtration for tanks of all sizes with their FILSTAR XP Canister filters and wide variety of filter media. These powerful filters constantly circulate the water, trapping organic waste and odors, removing harmful ammonia and contaminants, and helping good bacteria to thrive in the tank.
Superior Nutrition
Feeding your aquarium inhabitants, whether they're tropical fish, turtles or newts, is something that can be tricky without the right food. API developed a special diet for every type of fish—one that's highly palatable, which leads to less waste in the tank. And that means less ammonia to cloud the water. For your turtle friends, premium floating pellets and stick treats provide multiple vitamins for a stronger, healthier shell.


About API
Through extensive and continuous research and development, API created quality products for all levels of fishkeeping. As people who are passionate about fish care, they understand the rewards of keeping up a successful aquarium or aquarium. With easy-to-read guides and premium treatments, foods, filters and testing equipment, API helps aquarists establish and maintain an environment where fish can flourish.
Customer Reviews

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5 Reviews
5 Reviews
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Excellent!
By Allie on Dec 2, 2020
After just two days our Betta with Columnaris was feeling much better. Swimming around and eating more than he had in a long time.
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Product quality
By Linda on Jul 24, 2020
I haven’t used this product yet. I used the product for General Cure first, and that product didn’t seem to work for what my fish is ailing with. I am about to use this product to see if it will work.
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Good when natural remedies didn't help
By Emily on Dec 10, 2017
I was recommended these through API after trying melafix and pimafix and still having red spots on my fishes gills. It took about 2 to 3 days to notice a difference but my gosh look happy and healthy again and are more active. The down side is it will turn your water a yellowish green color but once you add the filter cartridge back in it takes it right out. Differently recommend for sick fish when natural remedies don't help as fast.
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This product cured my Betta's stubborn columnaris infection. Definitely recommend it to all my fellow aquarists.
By Alisheeba on Feb 24, 2017
This product cured my Betta's stubborn columnaris infection. Definitely recommend it to all my fellow aquarists.
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Furan-2 is excellent for bacterial fish diseases
By Ralph on Aug 5, 2016
I have used this product for quite a while when treating my discus. They have always responded well to this product