Brittle Star and Serpent Star Removal

So while I think these guys are super cool looking, they have been taking out some prized possessions in my 600g reef tank. So far I am sure they have been devouring every peppermint shrimp I drop in, as well as a few different fish. Most devastating was them killing my giant clam and possibly my anemone (or atleast i think they pushed it to detach and once it detached it never reattached and eventually shrank to almost nothing...)

So my question is, does anyone have a good method for removing them? I have a very large rockscape that they constantly hide in. I have successfully removed 3 so far but they take a ton of time to try and catch and usually their legs break off rather than me being able to pick them out...

Any advice is much appreciated.

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