Hi Ray,
Fellow keyboard player here (you can probably figure out by the name, assisted living methuen), sorry for not staying in touch ANYWAY - there was a time when I used to have alot of these in my system, not necessarily a bad thing, they never touched my coral and I am sure they do alot of scavenging. In the end, though, I think that there may be several types, some not so good. Anthony Calfo doesn't seem to think they are bad in general. If he is really bothering you, there are actually bristleworm traps, not too much money. In the meantime, I would just keep an eye on my corals for signs of chewing