Umh, I respectfully disagree FL it looks like a Majano species to me. Most of these guys are considered pests and it will take over your tank if given the chance. There are a few species that aren't as prolific as the rest but, I would either keep a really close eye on it or just not take the risk in a reef tank. In a fowlr it wouldn't be as big a deal but, in most cases you can pretty much think orange astapsia because they will pretty much do the same thing. I do have a 10 gall that's has some of these guys cause I think that they are pretty and are VERY easy to take care of but, I wouldn't put them in my reef on a dare.
Hth
Chris