I have one with a few mushrooms, fungia, ricordea, cyphastrea. No problems. But I do have an automatic feeder which gives a bit four times daily, and lots of live rock (200 pounds in a 180). So lots of food available to pick at. Two lemon butterfly (C. miliaris) as well. Depends on your risk tolerance, of course. I'm more interested in fish than corals, and I don't spend more than fifteen for any coral, so I don't really care if they get picked at.
Bruce