I've got 200 blue leg hermits arriving this week. I'm hoping the hermits will irritate them by interfering their their nets and possibly steal food from them when it gets caught in the net before they are able to reel it in. Also considering a bunch of cleaner shrimp, as I have seen these reach into the mouth of LPS to steal food I'm thinking they may do the same with vermetids.
Urchins may be another good option, even if they don't eat them directly or on purpose they might damage or irritate the vermetids during their general bulldozing.
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