The ironic thing is, one of the barbels of the aro seems to have been messed up (folds up in the middle), I believe the recently added Pacu might have been the culprit!
Seriously, I don't get how people can put up with these Pacus, they are NEVER full, they chew on everything (electrical cords, heaters, thermometers), they bite tank mates, they bust tanks, they bite owner fingers *&$^#%@...