I'll take "what's this worm for 200" R2R

[sp1187]

hard spiral shell, spits out a spider web

 

[Brit’s Fish]

Pyramidellid worm, I think. They’re gross but not seriously harmful. You can always scrape them off the rock or seal them in with glue. They do tend to spread.
Edit: wrong name! Vermetid snail... long day lol

 

[WV Reefer]

hard spiral shell, spits out a spider web

Vermetid snail.

 

[JGT]

Vermetid. Can irritate corals with their mucous net. Terminate.

 

[sp1187]

terminate? naaa..... I have had this one and one other in another spot for over a year.
haven't reproduced and don't bother zoas, palys, cloves or shrooms surrounding them.

 

[JGT]

terminate? naaa..... I have had this one and one other in another spot for over a year.
haven't reproduced and don't bother zoas, palys, cloves or shrooms surrounding them.

That could change. If it does.. you know what to do...needle nose pliers are my weapon of choice.

 

[Pkunk35]

I think the problem is they can reach plague like populations while being difficult to kill as they are so successful.