Help with ID Please

Can anyone give me an idea of what these are? They hitchhiked in on some LR rubble I got from the frag swap on Saturday.

This first one is kinda blurry but never extends more than this. I was thinking maybe aiptasia but maybe majano. It is about 1/4" in diameter:

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These next 2 of the same thing are about 1/2" to 5/8"across.

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I still need an id on the first, but after seeing the other one (the 2nd and 3rd pic) deploy a couple of spider web fishing lines after lights out tonight, I am pretty sure it is a vermetid snail. Pretty cool hitcher as long as he doesn't irritate corals at a later date. I'll try to get some sharper pics tomorrow.
 
Here's a green Majano to compare against:
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