Goldfish Care Requirements

December 7, 2009

A 20-gallon tank is about right for one fish, but if you want more than one, you are going to need at least 10 additional gallons per adult fish. Many people are shocked at the thought of a 55-gallon tank for 3-4 goldfish, but that is the minimum that they need. If you really want to see them reach their full potential, they should be in a 90-gallon tank. Remember, these fish get big and they produce a large amount of waste, so they need a large quantity of water.

via Pet Education

I have always been curious on the minimum requirements for a goldfish. For some reason, I thought perhaps 20g per fish, but the above metric seems about right.  I think a lot of people will be in for a rude awakening about goldfish if they don't heed the warning.
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