So I have been having some issues with my ricordea and some zoanthid frags disappearing on the left side of my tank. After many late night flash light sessions I finally found what I believe was the culprit; a eunicid worm. The problem was he had taken shelter in a rock that supported a good portion of my scape, so removing him would be a pain. I was originally going to leave him be until I broke this tank down seeing as he never left the general area, especially his chosen rock.
Couple months later, after seeing how fast he was growing and how large he had become in such a short time I made the decision he was coming out NOW! Who knows what kind of havoc he would cause when it got bigger and more hungry.
I yanked the rock and supported the structure with some rubble I had laying around. It worked very well and my scape is pretty much unchanged. I then fw dipped the rock to subdue him, then pulled him out with some pliers
He was a lot larger then I thought as previously I had maybe seen half of his body at most before he'd shoot back inot his rock.
Here are some pics of the guy and a few of the tank for the heck of it.
supporting the structure
the worm