I agree that a lawnmower blenny would probably be better. I have a bi-color blenny and he didn't help me much in my time of need concerning algae.
I don't think that there will be a problem. Blennies (Bi-Colors, anyway) can be pretty aggressive if messed with. My blenny is the only fish that my sebae clown doesn't push around at all. Occassionally he tries, but he gets put in his place real fast. Not to mention that if you have a lot of rock, the blenny has a few safe spots, most likely.
92-gallon corner tank, 100lbs of LR
, 140lbs of sand, 250watt 10,000K MH
, 110watts of actinic PCs, Mag 7 return, custom refugium, AquaC EV180 w/ Mag 5
Female lyretail anthias, eyelash blenny, tomato clown, saddleback clown, firefish goby, 2 sand-sifting stars