Need help identifying!! Good or bad?

[Rosete619]

Can any one help me identify a growth. It's on a frag plug with two like antennas coming out and has a web extended out to a rock and is about the side of a pen tip. Color seems to be black. What could it be?

 

[James M]

Welcome to reef2reef !!!
Need pics

 

[Gareth elliott]

Welcome

Does it look like this?

Complete guess based on the web statement and 2 pins.

 

[reef lover]

Welcome to r2r! Vermetid snail...epoxy over or crush.