sammystingray - Yep, that is algae. There is red macroalgae all over this rock, some of the plants are getting to be about 6" tall now. But I think my caluerpa is out competing it.
BangGuy - I hope he is an aiptasia predator, because he has his work cut out for him.
j21kickster - Yeah, I'm keeping my eye on him. Kinda hard though since he is nocturnal.
vibe - your slug sounds like a stomatella snail (sp?). I have one too.
Thanks for the replies! Here is a better pic of the macroalgae, and a pretty orange tunicate similar to the other pic. So far the only things I have found that I would consider pest are the aiptasia and a horse conch.