Well, its been going good, he has inhaled feeder guppies, a good almost 6 inches. It seems they have decided a dominance order. The bigparrot just sits in the cave. to lazy to fight, to big to mess with. the litttle parrot and knife seem to be tied. the knife is not afraid to bite the annoying pictus, but the thing is stubborn, and entergetic, so it keeps going back. My synodontis E. (same size as knife) is the alpha. it bites the knife when it gets close, other than that it is a rock. the knife has some scraches on it but still is a healthy silver. they are able to take a beating right? At what point should be worried?