if you have your hands always in your tank(s), you will hate them.

Otherwise they are harmless

The last two paragraphs of this article have some interesting things to say about bristle worms:

http://www.fishchannel.com/saltwater...us-snails.aspx

haha for everone you see their are probaly 10 to 20 you don't. I have lots and they never bother anything tho. I just went and bought a dragon wrasse i starve him for a few day and then like magic theirs a few less worms. That and if i see one out in the open I pull them out just to keep their numbers down.:lol:

If your bristle worm looks like this one its a bad one but i think all other ones are good. I pulled 4 of these out of one of my tanks one of them found a dead turbo snail and 2 of these eating it. I took those 2 out and then put the snail back in for bait and got 2 more. They are called hermodice carunculata.

Don't like the looks of that worm!
 

I really dont like the looks of them.. I usually get rid of them by taking a syringe and warming up some Lemon juice and squirt the hole they came out of. Kills them right away:twised:... Works good if you only have a few...as for a few hundred.... better buy some bulk Lemon Juice! lol!

We have tons of them in our 90 gallon reef. But we do remove the larger ones when we see them, mainly because they are bigger then our small goby. Other then that, glad to have the extra cleaners.