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API Algaefix Algae Control Aquarium Solution

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Treat and control algae growth and reduce your freshwater aquarium maintenance with API Algaefix Algae Control in Aquariums. This revolutionary product is specially developed to control many types of algae including green water algae blooms and string or hair algae and will not harm fish or plants. To treat algae, add 1 ml for every 10 gallons of water and repeat for three days until algae is controlled. Use weekly to keep aquariums clean and clear. Do not use with freshwater crustaceans including shrimp, crabs and lobsters. For indoor aquarium use only.

Key Benefits
  • Specially developed to help treat and control algae growth.
  • May help to reduce the amount of maintenance your aquarium requires.
  • Safe enough that it can be used weekly and will not harm your fish or plants.
  • Effectively controls ldquo green water rdquo algal blooms and string or hair algae.
  • Not for use in saltwater or with freshwater crustaceans and recommended for indoor aquarium use only.

HAZARDS TO ANIMALS: For indoor aquarium use only. Do not use ALGAEFIX with freshwater crustaceans including shrimp crabs and lobsters. HAZARDS TO HUMANS: Keep out of reach of children. Harmful if swallowed or absorbed through the skin. Avoid contact with skin, eyes or clothing. Wash thoroughly with soap and water after handling.

Help keep your glass aquarium extra clean with API's Algae Scraper.

Help keep your acrylic aquarium extra clean with API's Algae Scraper.

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  • Item Number
  • Aquarium Type
  • Fish Type
    Tropical Freshwater, Betta, Cichlid, Goldfish
  • Product Form

Add 1/5 teaspoon for each 10 U.S. gallons or 1 teaspoon for each 50 U.S. gallons of aquarium water. Repeat dose every 3 days until algae is controlled. Siphon or scrape any dead algae from the aquarium. Once algal growth is under control add 1 dose per week. Weekly doses of ALGAEFIX will control algal growth and reduce aquarium maintenance.


Should API ALGAEFIX and ECOFIX be used at the same time, or should sludge remover be added after all the API ALGAEFIX treatments are completed?

It is best to use API ALGAEFIX on its own until algae is under control.

How much API ALGAEFIX is needed per gallon?

To ensure accurate dosing of API ALGAEFIX, determine pond volume before use. Add 1 teaspoon for each 50 U.S. gallons of pond/fountain water, or ¼ cup for each 600 gallons. Thoroughly mix into pond water by adding near the pump outflow, waterfall, or aeration device. API POND ALGAEFIX may be mixed in a bucket of the pond/fountain water and dispersed evenly around the pond. Repeat dose every 3 days until algae is controlled. Be prepared to siphon out dead algae. Once algae growth has subsided, add one dose of API POND ALGAEFIX per week, as weekly treatments will control algal growth and reduce pond maintenance.

Can API® ALGAEFIX be used in concrete fountains?

API ALGAEFIX is designed for use in synthetic-lined ponds and fountains only.

Can API ALGAEFIX be used around aquatic turtles?

API ALGAEFIX can be used in a turtle habitat. Do not use in aquariums that house crustaceans such as shrimp, crabs, or lobsters.

Is API ALGAEFIX OK to use with a Plecostomus and a Catfish in the tank?

Your fish can remain in the aquarium when you treat using API ALGAEFIX. Do not use with crustaceans.

My aquarium has been affected by a major algae bloom. Do you carry a product that kills algae, but does not kill snails?

We’d recommend API ALGAEFIX MARINE aquarium algaecide, which will not harm marine fish, corals, or invertebrates (snails).

Can this API ALGAEFIX be used with aquarium plants?

API ALGAEFIX is safe for use with aquarium plants.

Can API ALGAEFIX be used in freshwater tanks?

Yes, API ALGAEFIX may be used in freshwater aquariums.

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.

Fish Care Made Easier
Maintain the Perfect Setup

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.

Testing Is Key
Clearing the Water

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.

Superior Nutrition
About API

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.

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Rating: 4.0 of 5 stars 57 Reviews 57 Reviews 4.1 out of 5 Stars

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88% Recommend

88% of reviewersrecommend this product

Rating: 4.0 of 5 stars 4.1 / 5

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57 Reviews

Showing 1-10 of 57 Reviews

  • 5 out of 5 stars

    Super clear tank in just a few hours!

    By Shelbysp on Aug 3, 2021

    Our fish tank started to get super cloudy and greenish/yellow colored and seemed to be getting worse. I ordered algaefix and in just 2 days I recieved it. The tank started clearing up 30 minutes after putting it in. In about 2 hours, my fish tank has never been this clear! My fish seem to be doing great also. I did not clean out the tank or do a water change since my levels were pretty normal despite the algae.

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  • 5 out of 5 stars

    works like a charm!!

    By Maria on Aug 11, 2021

    our fish tank was so cloudy and green. could barely see our 3 goldfish that we’ve had for 2 years. added the recommended drops of these to my tank and the water is much more clear. i still need to change the water but as i wait for my water pump, i am using this meanwhile!

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  • 5 out of 5 stars

    Keep your pool clean

    By Linda on Jul 29, 2021

    It keeps the algae in our fish ponds. When we don’t use it we have awful green algae in the water. It’s safe for gold fish too.

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  • 1 out of 5 stars

    Dead/dying fish

    By Fishy16 on Apr 2, 2021

    Have a 36 gallon bow front, added a little less than 3.5 ml per dosing instructions. Repeated 3 days later with a small water change because some of the fish seemed stressed. Algae started dying...but so did my fish!!! Have been cleaning off dead algae and done two more 30% water changes. Lost 75% of my bottom feeders and 3 top feeders. Will not be using this anymore. Quite saddened. :(

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  • 5 out of 5 stars

    Algae control

    By GailB on May 20, 2021

    The tank looks great & all occupants are healthy. I will continue to use this product.

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  • 5 out of 5 stars

    API Algaefix

    By 1234 on Feb 3, 2021

    I had severe algae bloom after fertilizing aquarium plants, phosphorus level was treated to normal, no improvement, one slightly lower than recommended dose of Algaefix cleared the whole tank and everyone survived.

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  • 5 out of 5 stars

    Works great

    By Mike on Jan 4, 2021

    I have a 20 gallon tank. Water keep turning green after i change it. I realized it’s because i leave the light on 24/7 but that was after i used this product. Tank was clear the next day and crystal clear after 2 days. Saved me from yet another water change.

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  • 1 out of 5 stars

    didnt work

    By missourinana on Mar 24, 2021

    didnt work, only thing it did was turn my black gold fish blue and make them rub against gravel

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  • 5 out of 5 stars

    Great choice

    By Lola on Jan 24, 2021

    Effective and I purchased a larger size for less that I would normally pay at the pet store for smaller size bottle

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  • 5 out of 5 stars

    Cleans in a few hours

    By Mochi on Jan 2, 2021

    It did a magical work to our fish tank that was green and disgusting, it worked in as little as few hours to sparkle clean tank.

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