Take what ever you feed and put it in a glass of wate, put the pellets in there and let them soak(for an hour or so. That way the flavor will set into the other food.. and when you feed put like 90%old food with 10% new. They will start taking the new stuff. All my rays are on that and they love it. Keep mixing foods its great for the rays. Everyday I feed shirmp-pellets-siversides-nightcrawlers. They love it 4 course meal . lol