A vermetid snail wouldn't really "burrow" it will just attach itself and start growing its tube outwards.
In my experience (if this is what you have), they proliferate a tank rather quickly, and although the main consensus seems to be that they're harmless, I find the cobwebs to be extremely unappealing visually; and I would go so far as to say they're not "really" harmless because in my experience it can irritate a coral to death where there is contact (be it zoanthid, other softeys, LPS, and especially SPS. They did a LOT of damage to the corals in my tank and I no longer let them be when they show up next to a coral.)
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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