API Goldfish Aquarium Cleaner, 4-oz bottle

Rated 3.375 out of 5 stars
$4.28Chewy Price
$5.98Chewy Price
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About This Item


  • Helps to clean the aquarium by breaking down solid waste.
  • Supports a healthy aquarium environment made from real, beneficial bacterial cultures and without adding more chemicals to your tank.
  • Helps to naturally break down solid waste, clean gravel, remove sludge and reduce ammonia and nitrite.
  • Can be used during your normal water change to keep your tank or bowl clean.
  • Helps to reduce toxic ammonia and nitrite by boosting the effectiveness of the biological filter in established aquariums.

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

Special Note

4-oz bottle treats up to 47 gallons.
Help your goldfish live in a safe environment with API's Goldfish Protect.

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 TypeGoldfishGoldfishGoldfishBetta, Bottom Feeder, Cichlid...Betta, Bottom Feeder, Cichlid...
Aquarium TypeFreshwater, PondFreshwater, PondFreshwater, PondSaltwater, FreshwaterSaltwater, Freshwater

Questions & Answers

5 Customer Questions

Can I use this if I also have plecos in my aquarium?
Answer by ChewyAug 12, 2022
While this product has been formulated to be strong enough for goldfish in particular, it is able to be used with all fish types.

With the cleaner would I have to take my fish out the tank and than add the cleaner or can I just put it in tank with the fish
Answer by ChewyMar 10, 2022
You would add this to your tank with the fish still in the tank.

how much of this do I used for a 10 gallon tank
Answer by ChewyFeb 28, 2021
It is recommended to add 1 ml. for each 0.5 gallon or 5 ml for each 2 gallons of aquarium water. A 10 gallon tank would need 20 ml.

is it safe to use it if you have a betta fish with the gold fish?
Answer by ChewyFeb 05, 2021
The Goldfish Aquarium Cleaner can be used with any type of fish, including bettas. However, goldfish and bettafish have very different water quality and heating requirements and therefore you may not have a positive experience if these two animals are being housed together.

ReviewsWrite a Review

Rated 3.375 out of 5 stars
8 Ratings
Would recommend to a friend

8 Customer Reviews

Rated 5 out of 5 stars
By Mettalicat on May 12, 2020

Only thing that works

This is the only product that actually removes the ammonia from my fish tank and keeps it away. My goldfish no longer has ammonia burns and is thriving.

Rated 2 out of 5 stars
By grambybear23 on Oct 18, 2019

Didnt work at all for my tank still cloudy after water change and this product.

Dont work i used it regularly and it did not change the water clarity at all.

Rated 1 out of 5 stars
By Chuck on Apr 8, 2019

does not seem to work

I have used four bottles and have seen no deafferents filter still slims up bad might work for others but not me

Rated 5 out of 5 stars
By Love on Apr 2, 2019

Excellent products

This product is amazing Works good you don’t need a lot of product. and it works Extremely good water stays clear and cleanI highly recommend this product

Rated 1 out of 5 stars
By Janice on Jun 9, 2018

It did nothing

I purchased a couple bottles and it didnt do a thing.

Rated 5 out of 5 stars
By Naya on Mar 25, 2018

Keeps the tank clean!

This stuff keeps my goldfish tank clear, and clean! I have to change filters less often and change water less often.

Rated 5 out of 5 stars
By whatshername on Aug 25, 2017


I have been fighting cloudy water in my 75 gal goldfish tank. Nothing would keep it clean .One a week 25% or more water change still would not get the water clear. Then once a month or so I would get this slime in the tubing. This stuff was nasty. It looked like it could be alive. With this product no more slime the water in the tank is so clear it is unreal. It takes about a 1/2 bottle per water change but it is well worth it.I have tried several different products nothing compares to this.

Rated 3 out of 5 stars
By Amy on Dec 20, 2016

No Difference

I didn't notice that this product made a difference in anyway to the water quality or the health of my goldfish. Also, the bottle is quite small, so if you have a larger aquarium, you'll need to order more than one bottle.