I'll also chime in here ...when I had a lawnmower blenny (my cat at the time nommed him) he'd only eat fine algae such as fine algae. Never touched GHA.I’d do blue legs also. Don’t be surprised if you get a lawnmower blenny and doesn’t eat your hair algae. Mine won’t but likes film algae. Cool fish tho.
Oooh, that could be my fun next fish to get!