Coral hosts are very common in reef tanks. Although some clowns are pickier than others, they will go into variety of corals. Normally corals do not appreciate it. I would watch your clown, as long as it is not wiggling too much in the coral, I would leave it. But the minute you see it unintentionally harassing the coral, I would remove one or the other.
I always find it interesting. One time my late clown used to live in star polyps colony. After awhile he realizes what he was doing and stop doing it though.
Btw, did you say you have a skunk and a maroon in the same tank???
stupid_naso