Here are the two things that I do to feed my CC
1. Put some frozen blood worms into the substrate, and then move the starfish on top of it. He immediately realizes what is going on, and "Digs In" to eat.
2. When he is sticking 2 fingers out of the water, I'll put some food directly into the center of his body. He'll hang onto it, and them move down slowly, and eat.
I don't know if thats good advice or not, but it works for me