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Just cut a piece off the crown of the top. Take a razor blade and slice just an edge off then take either super glue or a rubberband to attach that piece to a rock. Toodstoal leather is what it is usually refered to. Nice coral and nice pic!
It should take about a week or so...maybe longer to recover. It will heal up pretty quickly though. It all depends on the size of your leather of how much you should cut off. I would recommend about an 1" or so. You can also cut that in half and it should grow also. It will take the frag about 1-2 weeks to full attach to the new rock you put it on. The new frag will grow almost identical to the mother colony. HTH