I think I had a few #3's in my tank but they were much smaller......try googling Cantharus Whelk.....or Columbellid snails (aka Dove Snails).....both are undesirable hitchikers so I removed mine just to be sure.
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35g Algae tank....some nuisance corals
-- Deltec MCE600 Skimmer
-- 4x36" GLO T5HO
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