I've tried using an arrow crab but it doesn't work. The arrow crab ignores the bristleworms almost all the time. I've only seem it eat a bristleworm once. But I think it caught it by accident crawling on the bottom of the aquarium. Most of the time the bristleworm gets scared back into their hole. I tried forceps as well but the worm breaks in half when it tries to escape. I also heard that a six line wrasse or foxface might eat them. What I've found most effective so far is a bristleworm trap. It's a green tube that opens on either end and a compartment in the middle to put food. I've caught many this way. I hope this helps.
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