[Dorkel Marine 1]

The only time my bicolor nipps is when he's seemingly taking algae off of the corals. The base of my Christmas tree coral at times gets a reddish brown film. Doesn't take long and Mr Blenny has it all cleaned off. It does appear though that he's nipping. However the coral is about 4" high. Not that big though. Other than that he leaves most corals alone. Except once when he seemed to have a central hole he liked to sit in. Every time I would put a frag near this hole he'd knock it off. He seemed to not want anything obstructing his view. After I moved it he left it alone. That happened a few times until I respected his lookout post or central hole. Thats been my experience with Mr. Blenny. Hope it helps.

George