yea, he's actually pretty active. He'll swim up and eat off your hand, very tame =) I was afraid he would sit on my sea fan, but he never does. His favorite "perch" is the magnetic cleaner that I park close to the top of the tank. He likes a good vantage point.
That algae is derbesia, I think. I looked at some of it under a microscope to try to ID it, and from the pics I had in the Julian Sprung "algae" book, I think that's what it is. Nothing seems to like to eat it. I'm fighting back the PO4 level, so hopefully with some more persistance it will start to die back.