i have 2 senegal bichrs in a 120 gallon and one of them (the one that doesnt come out as much) has a perfect tail while the others (comes out more) back fin is nipped bad. other fish in the tank are 1-kirin parrot, 1-blood parrot, 3-congo tetras (im thinking its these guys bc i cant get them anymore schoolers yet bc id have to special order them), 1-bristlenose pleco.