Tried cat pill with beef heart. Only fish that was keen is the big Angle. will try smaller dose mix. If I take my Cardinail/Neon Tetras out of this tank well they be ok to put with Discus. I'm sure that you'll say no but if I can't get this problem solved I'll be left with a tank of live food for the Angles that are growing. All the fish in the tank look great apart from 1 silver Angle and 2 Black Angles (8 Angles, 2 Gromi's, 1 Pleco, 1Red Tail, 2 Kuli, 5 Guppies, and 12 Tetras).