I am just wondering what people do to maintain their snails shells. It seems no matter what I do I can not get them to stay as flawless as most of the people I see selling them. Have a pH from 7.6 to 7.8 in most of my snail tanks and the water is moderately hard. Yet the shells seem to erode. I have tried adding different nutrients to no real effect. Is it possibly a growth rate thing?