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Re: All my snails died... ???

> Any way, my problem is, when I switched to RO water from tap water, I noticed a slow decrease in the snail population.  Now I don't have any that I'm aware of.  I don't know if the switch to RO water was the cause, or simple coincidence.  Any ideas what would
> cause this?  Anything I can change to make the tank more "snail friendly"?  I read somewhere (don't remember where) that it could be related to carbonate hardness beging too low.  Is this correct, and if so why, and how do I fix it.

	I have four tanks.  In two of them in which I use mainly tap water
(hard well water) with some R.O. water, snails thrive.  In another which 
has CO2 and much lower hardness (GH and KH about 4), the snail population
died out.  The pH in that tank is about 6.8, and in the others it is over
8.0.  I suspect that snails do not cope well either with the lower pH or
the lower calcium concentrations that come with lower KH 
and lower GH, respectively.  The CO2 won't help either, by lowering pH.

Paul Sears        Ottawa, Canada