Goldfish are interactive fish. Although most of them are hardy, they, however, love tanks that will give them space to swim around freely. The size of their container can also determine how well you will be able to feed them. The tank size for goldfish can vary depending on if you are keeping fancy goldfish or the hardy ones. On average, the hardy variant of goldfish requires about 40 gallons, while the fancy goldfish, on the other hand, requires a minimum of 30 gallons.
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