Well Colwns are lets say it in a nice way crazy, i have seen them host many things. Like powerheads, rocks, sand, filter intakes, and so on. Clowns will choose for themselfs what they preffer and it is not always a anemone even if one is present. The problem with them hosting LPS is as they mature they tend to be pretty rough on LPS and this normally leads to the demise of the coral. If they host something like a leather or xenia i would not worry as much because they are pretty tough and can not be irratated as easily.