maybe a Sea Hare???

I thought sea hare's are mostly used for hair algae...

well i just went through the same exact thing the person i bought my established reef off of did not know how to work the lights so they had the actinic as the night moon lights and as a result the only thing to grow was algae and that kelp you have. i talked to a lfs employee about options and he suggested sea hare however they are ugly as sin instead i went with an emerald crab and an urchin, i got a snowball urchin with shorter spines and combined they work miracles. i still have a couple spots of algae but nothing near what it was (every rock was covered) and its only been two weeks and from what i have read once the algae is gone the urchin will readily take lettuce. the best part is they look much more appealing than a hare

Not sure...if thats all they eat, but "Maybe"
I would have said a Lawnmower Blennie as well but someone else did that already...You would think there would have to be something out there that eats it..

kdpuffer- thanks for the info. I have to agree, sea hare are horrible looking and I don't really want to put one in our tank. An urchin may be a better alternative.

dsaundry- I hope there's something as well. I guess I'll keep on doing some more research and see what I come up with.

yup, mine worked like a charm, it's almost all clear, I'll have to bring him back soon.