ID please

[Schad7]

I hope this pic uploads correctly. Can anyone help me ID the growth under this frag? Its hard to the touch and has spread to the rock around this frag. I have searched for similar things but have been unable to figure out what it is. Thanks!

 

[Schad7]

Second attempt

Second attempt

http://i738.photobucket.com/albums/xx28/Pete_Tracy/growth20under20frag_zpsho3y9kv8.jpg

 

[Schad7]

Can anyone help ID please?

 

[alb_56]

Vermetid snails or colonial hydroids would be my
Guess.

 

[thegrun]

Here is the photo:

 

[pyithar]

some type of sponge?