Is this C. Solandri?
I've had one in a 40 gallon softy tank for a couple of years and it's shown no interest in any of the corals (leathers, nephthea, anthelia, a few zoanthids) or anemones (LTA and s. tapedum) it's been kept with.
It looks like I've just gotten very lucky based on things others have said.
It does eat snails, however, and I'm assuming it would also eat shrimp and hermits, and I've seen him eat mini brittle stars when they are unlucky enough to be dislodged from rock. He has not gone after my very large brittle star. So, they can be tough on the cleanup crew even if they leave corals alone.