I've kept many fish in my day, including Red Snakeheads, and (boring) Wolf fish. The Wolf fish ultimatley can be kept with nothing, including hardy large cichlids. Wolf fish prey on Piranaha in the Amazon (not saying this means anything, because a pack of Piranaha prey on Wolf's as well). The problem with a large cichlid is that they are typically very territorial and will attempt to joust with a Wolf to their ultimate demise. Some Cichlids have some decent teeth, but the Wolf has daggers made to kill....