Should this guy concern me?

[mseepman]

I was just peeking into my tank last night when I saw what I thought was a polyp that I didn't recognize.

When I got a little closer, it pulled back some but didn't close. After a closer inspection and a few fuzzy pictures I think it might be a worm...and not a good kind of worm.

Here's a picture...can anyone confirm what this might be... Note that though it's not sticking out far right now...it was out about another inch when I first saw it. It's a little thicker than a pencil by my estimation.





Thanks for any suggestions.