No, Im not sure what they eat. Usually I feed with Rod food original. Everything eats it, recently I've been feeding with spectrum small and large pellets. Haven't gotten around to ordering more food. To the best of my knowlage its a red knob. There not supposed to be reef safe but the guys at the lfs
told me they are fine. He actually had this one in his reef display tank for a while. I also had him for over a year with no problems. He's now lost all of his legs, but he still climes the glass all day. Its sad really, I don't like watching.