I didn't find mine difficult to feed. they all ate whatever I put in the tank. I had the same problem with CBB as my Moorish Idols: They have those tiny mouths and don't eat fast. they are the ultimate grazers and need food seemingly 24/7. that is why I think they die. If there are competitors for food, they don't get much. They get some food but not enough to match their really fast metabolism and they slowly starve to death. Just my experience, tho.
-Doc