My first experience with one was when I was a real newb & I was walking past the tank at like 2am & saw the silhouette of something in the moonlight swimming/wriggling through the water like crazy... I thought omg wtf is that!!! Ran & got a flashlight & found that it was a 6" long bristle worm! I didn't even know they could get big like that at the time so I was really like omg wtf!!! Got the tweezers & pulled him out & immediately got online & started googling... This was before I knew about scr, otherwise I'm sure there would have been a thread similar to this one started by me