Assertion: piranha's tank | /r/HasProperty | 15-30 gallons
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text: Baby piranha's can - temporarily - be housed in a relatively small tank (15-30 gallons or 60-120 liter, depending on the species and number of fish) to raise them to a certain length, but youngsters grow very fast (Pygocentrus piranha's in particular), and when they are about seven to nine months old they measure about 4-6" (10-15cm.) in length, and should be moved to a larger tank.