I am experimenting with a 55 gallon tank. Currently I have 3 exodons, 1 pictus cat, 1 kenyii african cichlid, 1 small red devil (going to move him soon), 1 male convict. I want an all predatory tank (exception of african, got him just cause hes mean as hell). I want all the fish to max out at about 6 inches. Any suggestions? I was thinking about adding a small birchir. Maybe a leaf fish?