I am/was in the same perdicament on not knowing what to do with bristle worms, but after doing alot of research, listening to everyone on here and watching them in my tank at night. I think they are fine and dont bother anything. However I am afraid of getting stung/bit or whatever. During my research on google I came across a pic of someone that got nailed by one and OMG! It look painfull. But if you do want to get some of them out I was told to get a small 12oz bottle put food inside, cut holes in it and lay it in your tank where you have seen them. I did not try this but was told it works well. Good luck!