I have heard that arrow crabs eat bristle worms. But then you have a problem if you get the arrow crab and it eats your fan worms and feather dusters as well or maybe even a fish. Also you can build a small trap using a glass and a piece of tubing large enough for a bristle worm to fit down.
If you don't feed your tank for a while and make the buggers really hungry they will usually go after the food you put inside the glass. However, you may catch other things as well.
But still need an answer to my question.
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