The problem I see with clown fish hosting in corals is that the corals may not be used to that type of activity. This may be detrimental to the coral.
I WOULDN'T want my clown to host in my corals, for fear that it might damage and hurt the coral. With that said, I don't have a say in it. The clown will do what it wants to do.
I have an abundance of Xenia and the clown never looked twice at it. It seems to like the GSP, though. But once I put in the BTA, there was no love for any of the corals.