Reviving an old thread here, but thought I would chime in. I have a 3" wrought iron in a mixed reef. I don't have many corals since I'm mainly a fish guy, but I recently added a 'space invader' chalice and a candy cane trumpet coral, and the little bugger has been nipping at both within an hour of me adding both corals. Both colonies are fairly large, but something will have to give. My immediate plan is to remove the candy cane since it's super stressed. I also have bubble tip anemones, a leather coral and a gold torch, and thus far I've only seen the wrought iron nip at the leather, although it doesn't do it anymore..
Also open to selling the wrought iron..