Oh man my cats go NUTS when i drop in flake, pellets or brine shrimp. They are the pigs of my tank. One day I thought one was dying his stomach was SO big, showed a pic to a LFS
african enthusiast who laughed and said he had eaten a lot. How long have you had the cats? Mine took quite a while to get brave, and I had to add a lot of rock for caves and hiding places. Mine were never thrilled with the bottom feeder tabs I bought them, actually the mbuna would devour them before most would hit the bottom. Your cats are eating, they will go around at night and vacuum up everything the cichlids missed.