You should check out the Reefkeeping article about these snails here.
http://http://reefkeeping.com/issues...1/mg/index.php
They were changed from genus Nassarius to genus Ilyanassa in the 70's.
Nassarius vibex are a different snail and a more appropriate species.
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Ilyanassa is not a reef snail at all. As a snail from cold and temperate water, keeping them at reef temperatures is sentencing them to a premature death. In addition, they aren't entirely reef safe, especially in tanks with sand beds.
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They are an intermediate host for nine species of trematode fluke. (swimmers itch)