Well ii know tilapia Butterkoferi arent supposed to have tankmates... but before i make my final decision on if i want to get rid of him i wanted to know if anything can be his tankmate besides a pleco. He was extremely agressive when he was younger but now at about 7" in a 55 all to himself he just moaps and rarely eats feeders. Do you guys think maybe a 7" clown knife or some other cichlids would work? I also heard if the Tilapia knows it is the most dominant it would leave all smaller fish alone like in an african cichlid tank? (dont know how valid that last point is) Thanks for any responses ~~~ Tom.