cbs isn't reef safe, will pick on corals. however, if you feed him, he shouldn't bother your fish/inverts. My last CBS just ate other shrimp. This one, hasn't bothered the other inverts, and when I asked, I was told he would get along with them.
It depends on the Cbs too, my last one wouldn't let anyone near it, if a fish went by him, he's perk up, but he never bothered the fish.