Worm Id help

[josephxsxn]

Just saw this worm in my display tank. It's very black and has like a grapling hook mouth. It's hard to see in the photo. Seems like it has a pretty nice hole that it's living in.

 

[josephxsxn]

I am thinking it may be a Palola worm. So not the typical Eunice. Mostly because it has the 5 antenna but seems to be missing the jaws, is black, and rock living. The article below helped me out with identification.

http://www.reefkeeping.com/issues/2003-04/rs/