I am thinking about getting a Black Moor Goldfish. I was wondering what size of tank would be best and if a filter would be needed? At first I was thinking a 5 gallon tank with an air stone, but I’ve seen several people saying they must have a 20 gallon at least? Would a 10 gallon tank be big...
10 gallon fish tank
20 gallon tank
5 gallon tank
air stone
appropriate tank size
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