i have skin allergy to bristle worms now, after accidentally grabbing them when they are wrapped around the bottom of frag plugs. The bristles also stick my arms and hands, whenever I was working in the system, leaning on the rim or some rock, pulling algae out (where they may be hiding etc) I hate them. I have to scrape the bristles out, by scraping a dull knife perpendicular to the skin, under running water. Whenever I touch a bristle worm by accident, I can see the line of bristles embedded on my skin and treat accordingly.
BTW I still have the tips of a small sea urchin embedded in my thumb and index finger from 2 years ago. They have slowly been growing outwards as my skin peels off when its dry. Very annoying. Unlike a wood splinter, the spines are so sharp and fine, I believe I keep pushing it into my skin over time, whereas a wooden splinter gets soft and sheds with my skin.
Never again will a bristle worm enter my new setups.