if you do go to the piranha road (big tank and big filters) then make sure what you buy are red belly piranhas, not red belly pacus, the pacu will grow much much much bigger and will need 300 gallons all by its self with 2000 gallons for a school of 6. They look the same when young (although im sure you can find tehre differences) and some lfs might trick you in buying pacus.
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