Thanks for the replies. I've considered a rabbitfish, I like he doliatus, just thought it would get too big. I also have some valonia growing I hope he might like, as well as a few mushrooms.
I do like the tailspot blennies, but didn't think they would eat much algae, especially this.
I had a yellow scopas tang that I sold, for reasons I won't get in to, that ate the stuff. I thought he had gotten rid of it all but in 2 months its grown back as in the pic and continues spreading to different rocks. The extend of the spreading would make it difficult to scrape it all off.
I've also considered a red/orange spot blenny, but been afraid that it might munch on my sps. Any thougts on this? Also have heard the lawnmower/starry blennies have this tendency occasionally too. Any thoughts on this?
Thanks again for all the great thoughts.