How to tell if your goldfish tank is too small for their health?

Question

How do I know when my goldfish tank is to small for the goldfish. Pet's info: Fish | Unknown - Fish

Angel Alvarado, LVT · Accepted Answer

Ideally, one goldfish should have 20 gallons of water. The reason being that goldfish produce a larger than average bio-load (wastes) than other fish. One fish can quickly overwhelm a small tank and filter. If you have a smaller tank, use a home test kit to monitor ammonia, nitrites and nitrates. When ammonia or nitrites begin to rise, it is time to perform a partial water change.

How to tell if your goldfish tank is too small for their health?

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