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Extremely required information: size of tank!

1 gallon = every 3 days

5 gallon = every 5-7 days

10 gallon = probably a week or two.

It does depend on your fish. What you should do, is test the ammonia every day. When ammonia shows up, mark how long it took, and that is how many days the tank can go without a complete change of water.

Cycled tanks are a different matter. They only need occasional partial changes.

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16y ago

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