API Algaefix Algae Control Aquarium Solution

Rated 3.5263 out of 5 stars


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About This Item


  • 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.

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Play Video: Learn More About API From Our Team of Experts
Learn More About API From Our Team of Experts

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

About API Water Conditioners

It’s Smart To Be Proactive!

The best way to keep your aquarium clean is to maintain good water quality. This will help keep your fish strong and vibrant and prevent disease. Water conditioners and test kits from API can help you keep your aquarium water safe and healthy.

How Do I Maintain a Healthy Environment?

It is important to test your aquarium water weekly to ensure it stays healthy for your fish.  In addition, a bi-weekly partial water change of no more than 25% will help reduce toxic buildup, remove debris the filter missed, and replenish the oxygen available to your fish.

Feed Twice Daily and Test Water Weekly

Feed your fish twice a day, check their water temperature, and observe them to make sure they are active. You should also test water quality weekly for optimal safety. For fish to thrive, their water must closely match that of their natural environment—poor water quality can cause stress, illness and even fish loss. The 6 important parameters for healthy aquarium water are ammonia, nitrite, nitrate, pH and water hardness (GH & KH). All of these can vary over time and are invisible to the eye.

Change Water and Restore the Ecosystem

In a closed aquarium environment, there are no natural rivers or streams to carry away debris and other waste materials. That is why you should replace 25% of your aquarium water every two weeks, making sure to add water conditioner to your tap water to make it safe for your fish. You should also change your filter media and clean your gravel monthly. Adding beneficial nitrifying bacteria with API Quick Start when you do will help restore your aquarium’s fragile ecosystem and avoid disruption.

What Do API Products Do and When Do I Use Them?

API Test Kits

Use test kits weekly to monitor water quality parameters, which can vary over time and impact the health of your fish.

API Stress Zyme

Using this every week will help keep your aquarium clean and your gravel and ornaments sludge-free.

API Algaefix

Use weekly to control algae growth and keep aquarium glass, ornaments and plants clean.

API Stress Coat

Use every 2 weeks during water changes to make tap water safe, and when adding fish, or when fish are injured.

About API

The team at API has a passion for fish and understands the rewards and relaxation fishkeeping can bring. For almost 60 years, they have developed premium products with a focus on proven and effective results. API offers a range of testing kits, water conditioners and nutritionally superior fish foods. They are dedicated to making a better underwater world for the benefit of fish and those who keep them.

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Fish TypeBetta, Cichlid, Goldfish, Tropical FreshwaterBetta, Bottom Feeder, Cichlid, Goldfish, Tropical FreshwaterBettaBetta, Cichlid, Goldfish, Tropical FreshwaterTropical Freshwater
Aquarium TypeFreshwaterFreshwaterFreshwaterFreshwaterFreshwater

Questions & Answers

28 Customer Questions

Will it harm snails? Used a product years ago that killed off of my snails. So I'm very nervous about an algae killer. Says it safe for fish and plants...but what about invertebrates?
Answer by ChewyMar 13, 2018
This product cannot be used with freshwater crustaceans (snails).

Can it be used for aquatic turtles?
Answer by ChewySep 06, 2017
This can be used in a turtle habitat. Do not use in aquariums that house crustaceans such as shrimp, crabs, or lobsters.

I have a small (2 or 2-1/2 gal) tank for my Betta. How much Algaefix would I add for this tank? You say 1 ml to 10 gallons. I assume it would only be drops. Pleas advise.
Answer by ChewyJun 14, 2020
It is recommended to use 1 mL for a 10 gallon tank so you'd need approximately 0.25 mL of this solution for a 2.5 gallon tank.

If I take my snails out of the tank and use the algae fix will it be safe to put them back in after a couple days
Answer by ChewyMay 20, 2020
We’d recommend using the API ALGAEFIX MARINE aquarium algaecide, which will not harm marine fish, corals, or invertebrates (snails).

ReviewsWrite a Review

Rated 3.5263 out of 5 stars
76 Ratings
Would recommend to a friend

75 Customer Reviews

Rated 2 out of 5 stars
By Timothy on Nov 10, 2023

It says itit'safe for all fish.. My fish in my 20 gallon seemed traumatized for days. But, my betta, in a 5 gal. didn't eat for 5 days. Layer around, basically dying, until changed all the water. Luckily, he came back. NOT KEWL