They are beneficial also as long as they don't take over your tank.
You don't need to target feed hermit crabs etc. which offers Bristleworms alot of food for them to grow and reproduce, as some people have done in the past. I would leave it in your tank. It's like having ants, they are beneficial to an extent, but when there are to many they become a problem. _________ 125gal.w/Mag9.5 return(dual megaflow)>Mag7 pump Aqua Cev180skimmer.Wave2k Hamilton Reefstar(2)250watthqi(mh)pend.a Yellow, Naso Tang Red Lip Blenny Percula Clown Demoiselles Niger Trigger F. Wrasses Ceriantharia Orn.Shrimp and Stars Hermits Queen Conch asst. snails> Stars Zoos shrooms Montipora Brains Gorgonians Favia Turbinaria(large+small polyp) Acropora Xenia Tridacna (CroceaMaximaSquamosa) Leathers <35+75gal.reef tank as well> 
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