This may not be helpful for all, but a predator makes short work of them. I added a clown trigger and he does not touch the corals but makes short work of ALL inverts. The only inverts I had were a sand sifting start fish that has been in one of my systems for over a year, and vermetid snails. He ate 4 of the 5 legs of the star and then never proceeded to bother him again. He is slowly healing and regrowing his legs. The snails were mostly gone in a week. I still have one or two pop up, but they do not last long.
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