I had another customer have their tank NUKED today by a mass death of snails they got from an online site. There are a ton of sellers in the Carolinas and Florida that are yanking Nassarius and Cerith snails right out of the ocean, FROM THOSE AREAS. PLEASE if you are going to buy snails from one of these places ask if they are hand collecting themselves locally. The majority of the snails do come cheaper, but they are also from the tempered waters of these areas so we do see a lot of die off because of that within a year of being put in a reef tank.
