IME they are not reef safe. I had one in my tank - not knowing that they weren't reef safe. For a long time, I couldn't figure out why some of my corals (including a brain) kept on dying. One day, I saw the crowry on a brain that was half dead. I tossed the crowy in the sump. Within weeks, most of my dying corals were coming back. So in my experience, they are not reef safe.
Minh