I am trying to very the diet with my rays but they just don't like anything I have tried except earthworms and ghost shrimp. I feed them mainly earthworms which starts a feeding frenzy and ghost shrimp every once in a while because they love them as well. They will not touch frozen krill even after a 2 day starve out. I have tried silversides which they nibble on but don't devour. I was thinking about trying beefheart which I used in the past when I kept bichirs and cichlids. Has anyone tried it with Rays?