What is this?

[Dhub]

I took the attached picture tonight while searching in my blenny's favorite hiding place. At the end of the arrow you can see a white worm like thing. Anyone have a clue what it is?


Thanks

[tetra-tag]

Have you noticed it moving? If not it could be the calcium carbonate tube of a Spirobid or other type of fanworm.
I don't think your picture has enough resolution to definitively ID it, but is most likely a harmless detrivore.

http://www.chucksaddiction.com/hitchhikers.html