Which one? A red-bellied pacu or a piranha? Pacus grow to 12 inches and more. Pacus are shoalers so it's best to decide on a 200-300 gallons to keep 4-6 of them with strong filtration. They are not to be kept unless your tank is more than 200 gallons. I wanted very much to have this fish restricted only to aquarists who can accommodate them on long-term basis.
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