Bristle worms are good for the tank as they clean rock, sand and whatever else. I haven't seen them eat a fish, unless the fish is already dead, I don't think they have the ability to catch and kill.
I personally would leave them, I have lots myself... IMO it is a sign of a healthy tank.
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Setup: 180G DT, 105G Refuge (approx. 300lbs LR, 150lbs Aragonite)
Hardware: Super Reef Octopus SSS-3000, Tunze ATO, Mag 18 return, 2x MP40W, 2X Koralia 4's Wavemaker
Lighting: 5ft Hamilton Belize Sun (2x250W MH, 2X80W T5HO)
Type of Aquarium: mixed reef (SPS & LPS) with fish
Dosing: Mg, Ca, Alk
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