15 gal

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You can buy them REALLY small and grow them out for about 15 minutes!! :)
 
Ok seriously.. I dont know much about p's but I know they get pretty big and need lots of swimming room.. but I'm sure the experts will be by shortly...
 
You could feed it to them. I am sure a fully grown pirhana could eat a 15 gal tank.
 
if you got a 1-2 inch serra species, you could keep it in there for about a year., then youd def need a much bigger tank. there are a few species that can live life in a 30 gallon though
 
You can use it a holding tank for your feeder fish. That is way to small for any piranha, I currently have a single red belly in 35 gallon tank all alone and I think it will out grow the tank in a few months.
 
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