Id please

[AdamPhe]

i bought a 6 line wrasse and he stirred up the sand to reveal this

 

[reeferfoxx]

The shell?

 

[cloak]

It's kind of hard to tell from that picture, but they could be feather dusters or just some type of worm.

http://reefkeeping.com/issues/2003-05/rs/ (Figures 5 & 10)