03-21-2005, 08:00 PM
Join Date: Jan 2004
Location: Soggy Central Mississippi
iTrader Positive Rating: 100%
When the snails get old, their shells begin to erode, especially if CO2 levels are high. There is a brownish protective covering on their shell, and if that gets scratched, scarred, or just wears out, then the calcium carbonate underneath begins to dissolve. Rapdily growing snails, with plenty of food do not show this.