I have a TON in my tank. They don't bother any of my corals. I view them as a beneficial part of the CUC. Some say that they eat coraline algae or corals, especially if they are a darker color.
Thanks guys. A bit split in opinions but seems pretty unanimous. Guess ill keep an eye on it for now. Doesn't move much n stays on LR. Only found it 2 days ago.