I fear you're chances of having a bristleworm free tank are pretty close to zero. You'll think you got them all, then one night, when you least expect it, you'll see one slithering from on hole of your rock to another. You won't know how it got there, but the chances are good that if you can see even a single one, there are dozens to hundreds more in there that you'll never see. Nothing will ever be able to eat them all once they're in there, because bristleworms are very rarely out in the open where something could eat them. They spend most of their time under/inside rocks, making more and more bristleworms to replace the unlucky few who do get noticed and removed, or eaten by a predator.
Perhaps a little exposure therapy is in order?
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