Snail ID

[marie]

Originally Posted by ReefJunkie

I have no idea what type it is, but we have 2 in our tank, one is exactly the same as the one in your pic and the other is white with a black pattern on its shell. They started out tiny and are now about 1/2 an inch, neither bother anyone else and they seem to eat algae, they mostly stick to the glass or hide out in the macro algae. I think they may be a type of vegitarian whelk or something. I wouldn't mind knowing what they are though.

Best i could come up with and they could be right was this from reefcentral

looks like a columbellid (Euplica or Pyrene species)
http://www.reefkeeping.com/issues/2005-11/rs/index.php

[niloc16]

i'll take a stab. i believe it is a whelk.