Any idea what these are?

[sammyanne]

After searching around, I can’t seem to identify these little things that are growing out of my sand bed.
I took a pic with my blue lights and whites only to make them a bit easier to see.

 

[lapin]

Maybe
Boergesenia forbesii

http://www.reefkeeping.com/issues/2002-02/hcj/feature/