I don't know if this is incidentally or not, but I have over the years kept two separate species of Clowns (different times) a ocellaris clownfish and later a tomato clownfish. Both of these fish were tank bred, and while I never introduced an anemone, they both gravitated to a coral over time. This was never anything I forced, it just happened. The Ocellaris started going to my hairy mushroom coral to the point it would try and feed all the heads, and the Tomato was always in the hammer Coral.Both species also seemed to like my yellow polyps and the Xenia (that stuff got out of hand though).
I never noticed any damage to the corals, especially the mushrooms, but again, that may just be an incidental.