they will eat anything they can get their mouths around, if that makes sense. Mine's eaten platies, cherry barbs, and a small rainbow fish I think. I keep mine with loaches and cichlids, but really anything bigger than half his size. Other long and narrow fish work too, like needlenose fish.
My guy doesn't only need live food, he does appreciate the occasional treat though!! Nom subsists off http://www.alphaprobreeders.com/prod...73176_zoom.JPG
and some algae/veggie wafers. I like to give him and the other guys frozen brine shrimp and chopped prawns on occasion, and they love worms too. Basically, they'll eat anything! XP