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Why is my Betta fish tank water cloudy after I cleaned it?

Updated On September 23rd, 2025

Pet's info: Fish | Unknown - Fish | Female

We have a Betta baby girl fish. We have the Marina Betta EZ Care tank. We added more water to clean it (instructions say so) and now the water is cloudy and merky. Did we do something wrong?

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Answered By Angel Alvarado, LVT

Licensed Veterinary Technician

Published on March 26th, 2018

This can happen when a tank is not properly cycled or if too much water is changed/added. Check water chemistry using a home test kit or by submitting a water sample for testing. Most pet stores will do this for free or for a small fee. Aim for 0 ppm ammonia and nitrites and 20 ppm or less nitrates. You will likely need to do partial water changes to keep ammonia levels in check until the tank clears up. Use only aged or conditioned water that is temperature matched to prevent stress or shock. Bettas do best between 78 F and 80 F. Brands for water conditioners include AmQuel Plus, NovAqua, Prime, StressCoat or StressZyme. These can be found in the aquarium section of the local Petco.

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