What’s coming out the side of my frogspawn?

[ASIN28]

I am going to dip this to make sure nothing is in it however it’s been pushing out this web like string. Not the coral itself but from the side of the skeleton it looks like there is a little creature with antennas but I can’t really tell. Anybody have this before?

 

[brmreefer]

Based on the description alone it is a vermetid snail. Hard to really see anything within the pic.

 

[Reefer40b]

I agree with brmreefer. white lighting is always better with pictures