mine plays in my xenia sometimes, but it doesnt host. actually, it shows more intrest in the bottle top i use to cover my sun coral than anything else in the tank.
clowns will host whatever strikes their fancy. powerheads, clams, any coral, just about anything. and some times they wont host anything. even if the naturally occuring host anemone is available for the clown.
i love this pic!
and yes they will. they host almost everything. i have 2 tanks in one my perc is hosting a mushroom shaped piece of life rock and the other (mated pair) is hosting a tiny green mushroom. its like killing it (female) she rubs her body on it like she is riding a horse. its kinda cute.