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I'll be honest, I don't know what that fish it. What I do know is that it is not a lawnmower blenny. Lawnmower blennys are also refered to as sailfin blennys, algae blennys, etc. But when you look at them they have a long fin along their back and their face has "horns" on it, giving it a face that looks like a horse almost. That guy has a very small fin and the face just isn't right.