lawnmower, and he is a fatty...right now Id say he is 3-4" long.
The barnacles would also be for a possible future addition of a pink spot shrimp goby. I dont want to take anything out of your tank, no big deal as Im not in a rush, blenny has been in the tank for a cpl months now, just seeing if I can give him a spot to sit besides on my zoas =P