If left undisturbed they will eventually attach to any solid object that they are placed on. If you have a certain rock you want them to cover in time you may want to use some epoxy or super glue to get them to hold for now. It always sucks to come home and find a coral that has fallen and landed upside down on top of another coral. They dont have to be in the rocks either. Like most LPS they do fine on the bottom in the sand.
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