I do have a jumbo green severum in with the dats. Only cichlid, and he has to stay in the corner most of the time. ALso a 14" pacu, 11" endli, 5 dats, flagtail, long nose distichodis. Severum is at the bottom of the pile. The 2 angelfish are the true rulers of the tank. Someday that bichir will eat them I am sure.