Just how large are you thinking? Some larger than usual community fish might also include some of the larger barbs (clown, arulius, spanner), silver dollars and silver/bala sharks. Some reasonably non-aggressive cichlids include the rainbow and angels as mentioned, acaras, festivum, keyhole. Firemouths possibly, individual temperaments vary. Alot of the commonly kept brackish water species grow fairly large if you want to go down that path.