As Sk8r said, trading them in at your LFS is the best way (mine were worth way more than I expected.) If that's not an option, Aiptasia-X works. Cover the whole shroom. I have to do that to a few every month since they have a bad habit of killing my other corals on contact. I've read you don't want to overdo it with Aiptasia-X since it can mess with your alkalinity if used in large quantities.
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Bob - San Diego
Current Tank Info: 125g mixed reef, 20g F/W planted
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