WOw thats pretty freaky looking. Making me think again about putting both mine in the same tank..... I know it amazes me everytime I feed them large shiners how quickly they swallow them with ease. I am talking like up to about 1/2 their length. I would assume they have to be pretty darn hungry before they would cannibalize. I am not sure though. It is difficult to find any good reliable info about the Armatus in the wild. I dunno why with their appearance you would think everyone would be a little more interested.