FWIW: My silver SWALLOWED a 5" turq. Severum a few years ago. it also ate one 5" albino oscar and killed another. Just recently it tried to eat a full grow 13+" tinfoil barb but it didnt work out as planned by the aro. He did eventualy kill it by just holding it in hi smouth for few hours and then spit it out eventually when it realized it was waaay to big to eat..