yeah, lawnmower blennies are much more likely to eat hair algae, but i think you shouldn't add one now, it would probably not get along with your red lipped. besides, there is no guarantee a LMB would eat the hair algae either. mine never touches the stuff any more. and yes, the red lip is eating when he picks at the rock, this is the same as my LMB, I can't actually see what he is eating when he picks at the rock, but I know he is cause his belly is always huge!