I hate bristle worms because when handling my frags or pulling my algae out , their hairs get into my skin and I have to clean them off before I get a rash, which last for days, while my body dissolves the hairs.
If your tank is fallow, they die instantly in fresh water. you can remove live rock for a freshwater dip. soft and hard corals are not hurt by dipping, but sponges, worms and other invertebrates will die out pretty quickly.