Except you are forgetting one fact: pacus do not makes a good aquarium fish, period. Which that is why he might tricking you to buy his problem fish so he don't have to deal with the pacu. It's like he just handed you his life problems and you dealt with it.No trickery. You don't sell a 10" Piranha for $20, that would be too good to be true.
It is definitely a Pacu, and it will do fine with the other fish in your tank.
#commonsensepeople
always asking for trouble mixing piranha with others.
