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Pacus aren't aggressive, but they are related to piranhas, and they have powerful jaws---they eat fruits and nuts/seeds in nature. They will defend themselves if they have to--I had one that beheaded a N. Venustus that was in the Pacu tank on an emergency basis. But in that case, the pacu was about twice the size of the cichlid.

I love pacus, they are one of my favorite fish species...but I have to agree with the other post; they shouldn't be kept in any tank that isn't in the 400+ gallon range. Not only do they get huge, they need some swimming room.
 
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