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One goldfish only needs about 3 gallons of water to comfortably live in, per inch of body length. That could be a larger bowl, and if you use a clip-on filtration and oxygenation system, well, there you go.So, I keep mine in a bowl.
I always saw tanks and bowls as two different shapes of containers... I mean, bowl by definition implies a curved, round shape. Tank, by contrast, is a square or rectangular container. Tanks can hold more water, but bowls can't get very big - 3 or 4 gallons is the maximum.