How many red piranha can i fit in my 15 gallon tank?

Answers:
None. They need a much bigger tank than that. If youo already bought the tank, how about getting an oscar or cichild?

~ZTM

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None. Piranha need a rather large tank to support there habitat requirements.

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Zero, they need at least a 30 for a single specimen.

MM

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ABOOUT 3-4 THATS KINDA SMALL U NEED LIKE A 40-50 GALLON ONE FOR LIKE 8-10 FISHES.I HAVE 6

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0 - they are too large for a 15 gallon tank. Get a larger tank - a 55 gallon will hold 3-4 if you don't add anything else.

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Why don't you keep asking the same question over and over, I'm sure at some point somebody will tell you what you want to hear.