www.applesnail.net has some really good forums about taking care of snails. Some of the people on there say they use Caltrate for bone & colon health, 600, calcium supplement. No vitamin D added For their snails.
Since I can't specifically link a post from their site, I'll copy and paste someone's question and the answers that I think relate.
Q - My snails of the species pomacea bridgesii, The shells are thinish, have no smooth outer shell covering, you can see the growth rings. And its layers are flakey. my ph is 8.2 all other parrameters are normal, whats the solution
A - 8.2 pH is a little high and can result in bad shells as much as pH that is too low.
Is it just the newest growth that is this way or the entire shell?
Reply - All growth. You can tell exactly when i purchase these adult snails from the lfs.
A - Growth lines happen to shells whenever there is any kind of change. Such as from one tank system (the store's) to another (yours). Even a day of no food can make a line.
Sometimes the shell growth change can be so dramatic it is almost another color.
There was also another post saying that 6.6 ph is too low for snails and that can affect the growth of their shells as well. You're best option though would be to really search their site if that doesn't sound like what is wrong with your snails. I would highly recommend the adding calcium though. Some people have also said they used cuttlebone (my turtles loved it and I think my snails used to nibble on it too) but they were saying that the Caltrate was a huge hit with snails and shrimp.
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