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Re: PH adjusting to CO2 and rising again

At 03:48 AM 9/23/00 -0400, you wrote:
>after the PH is just where I want it, and stays that way for a couple of
>months (with bottle changes of course), it often rises back up to the old
>high level again

This sounds like a slow dissolving base (such as CaCO3 from shell bits in 
your gravel).  If you take a sample of the gravel and pour acid on it, does 
it fizz?

Dave Gomberg, San Francisco            mailto:gomberg at wcf_com
NEW Planted Aquaria Magazine:        http://www.wcf.com/pam