Although short-lived in my tank, my first Lawnmower Blenny - Salarias fasciatus - had a lot of character and loved to pose for the camera. I had hoped it would live up to its name and eat green hair algae, but after a while it was nowhere to be found. Fortunately, I don't have any of that algae either. Reef-safe.
I got another one a few years later and it was quite the character. It would leave kiss marks on the glass where it fed on film algae, and even tried to chomp on the side of Spock, a Naso tang, who was ready to retaliate with teeth bared. She was not pleased.