I have a Murphy also. Of the eight Discus I have he is the only one that I have never actually seen eat beef heart. Six really go after it, one picks at the crumbs, and my Murphy swims with the pack but does not eat the BH. He eats FDBW and pellets. He is also one of the two smallest. We refer to them as the problem children. This is why I started with eight instead of six.