For a worm that long you may have to build your own worm trap, other than that pull out your rock, they like to live underneath it, use rubber gloves and catch em by hand or go with a hypersaline dip for the rock.
FWIW most bristle worms are not harmful and infact quite the opposite. They clean your sand, your rock etc of crud that accumulates, if a fish or something else dies a few bristle worms can polish it off before it starts to polute your tank. I believe they wont reproduce if there isn't enough food for them to do so, I'd suggest cut your feedings down, way down and see if they don't start to go away. I'd leave a few though, just my opinion.
Doug
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