It certainly looks like a vermetid snail. Could it possibly either be coiled and hence appear less tubular and more disc-like? Or perhaps its tube is in fact in the rock?
By the way, those are not tentacles as such but rather a gooey web the snail creates, like a spider's web in a sense I suppose.
I had two of the tubular type and was disappointed when one died during a mini-crash. Someone in Calgary has the other, I have no idea who though.
http://www.reefs.org/library/aquariu...97/0897_8.html
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-Quinn
Man, n. ...His chief occupation is extermination of other animals and his own species, which, however, multiplies with such insistent rapidity as to infest the whole habitable earth, and Canada. - A. Bierce, Devil's Dictionary, 1906
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