Hi Kat4,
Sorry to hear about that. I had one that seemed fine in the LFS but a day after I bought it I noticed a white "glob" that just kept spreading and spreading until the skeleton became exposed, at that point it seemed like it was over so I tossed it. I guess what I am trying to say is that brain corals are very hardy as long as they are intact. Once they have any kind of injury on them they seem to go downhill fast. Wish I had better news for you. I guess you could try the iodine dip anyway.