Black Combtooth Blenny... not so reef safe

So all of my experience and everything I’ve read has told me these guys are reef safe… Started with my green Montipora digitata and has started to graze on the orange as well. There is no shortage of food in the tank as the fish is extremely bloated and full. I have a new magnificent foxface in the tank that is not as fat as I would like it to be, so I have been more then overfeeding the system. Everyfish has it’s own personality and I suppose I just found one that won’t work in my mixed reef.

This is the one that looks similar to the bi-color blenny, right? They just have big teeth? (lower jaw) I thought these guys were herbivores. I think this is the fish I have, not positive though. Mine is reef safe, just picks up food & algae on corals. Guess there is one in every bunch.

It’s eating a good bit of the algae off the glass, but also nipping at the digis and has caused significant damage already. No other corals seem to be harmed. Here is the exact fish: