Thanks.  I think you're probably right.  I'll try some calcium supplement
and see what happens.

Fred


"Robert Flory"  wrote in message
news:L2Cma.1636$1E7.98306084{at}newssvr21.news.prodigy.com...
> 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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