Vermitid Snails

[Lampshade]

I've got some zoa frag's that have been doing well, growing, etc. But recetnly i've noticed that i've had a couple Vermitid Snail's have moved in on one or possibly 2 of the frags. I've got a couple in my tank, never worried about them, however these 2 have been spitting out there web stuff, which is causing the zoa's to close up. They're closed about 50% of the time now, and it seems that this may effect their growth.

So the question is, how do i take them out? i tried tweezers last night, broke off the tube, waited for it to come out then smashed his head this didn't work, they're back today spitting out their strings of stuff. Should i use boiling water in a syringe? kalk? or even try to pull it out rather than smashing it? anyone had this problem?