What is you kH and gH.  It sounds like you have low calcium.

Bob
"Dred Anath"  wrote in message
news:ZeOcnZ6_hKOIUQejXTWcqg{at}giganews.com...
> I have a few ramshorn snails in a freshwater 55g community tank.  pH=7.5.
> Temp=77 degrees.  Bi-weekly 20% water changes.  Filtration by proquatics
> canister filter as well as hotmagnum.  Snalis have been there for many
> months.  Problem is the exterior of their shells is slowly but
progressively
> , it looks like dissolving.  The normal green/brown color of the shells is
> being replaced by the bony white that exists under the outer layer.
Almost
> as if their shells were being slowly sanded off.  They are otherwise
> healthy, they mate and lay eggs and are growing.  What am I doing wrong?
>
>
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