Found in coral frag

[Box_of_fins]

I recently started buying frags for my tank. I just noticed this on one of them. I saw it pulling in what looked like spider webs last night. It has a cap at the end of the shell like a snail has. Does anyone have any ideas?

 

[Sniperhank]

Looks like a vermetid snail to me. They aren't very healthy for SPS corals, but I have several of them on a trumpet coral colony I have without issue. They feed by shooting out the webs and filter feed through that.

 

[Box_of_fins]

That is exactly what it is. Thanks so much