In another thread someone was talking about using sundial snails to eat them. I often just remove rocks that have soft coral growing on them that I do not like and set them in the dark in my sump to die off slowly. But that can take several months to work. cdp's idea to trade the rocks in at your LFS for some new rock is probably the best idea if they will take them. Drying out the rocks or using a small butane torch often works as well but thats a little destructive.
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