ID Please

Just noticed a ton of these worms poking out of my sandbed. They come out about a half inch to an inch out of the sandbed and are about the thickness of thread. I assume they're generally benign to have but can anyone positively ID? Thanks.

http://s1135.photobucket.com/albums/m640/Simon_Tan/
 
Here you go: http://www.melevsreef.com/id/dualpalps.html
 
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