Sorry to chime in about this, but I was under the impression that bristles are good and serve the same purpose as a lot of the animals we buy on purpose to be in our sand, rock, etc.
We have all heard the stories of the giant squid bristle worms that kill fish, but did not think those were really true? I used to have bristle worm traps in my old tank, but now I thought they were good. Am I missing something? :notsure: