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Re: Why does KH drop?

Jim Miller wrote:
> I've got a little 3G tank with a half dozen plants in it and one fish for
> the time being. Flourite substrate, 2W/G, 10mg CO2, pH7.2 and KH currently
> 7.  My water comes out of the tap at pH 7.8 and KH4.  I put some baking soda
> in and raised the KH to 9 but it seems to creep down about 0.5 point per
> day.
> Why would the KH drop? Is the substrate stabilizing or something?
> tnx
> jtm

Many plants can crack carbonate or bicarbonate ions to get their carbon.
In such a small tank I imagine that six plants could do that pretty
quickly. I bet that's what's happening. Try increasing your CO2 a bit
and see if it doesn't stop dropping. The carbon is CO2 is easier to get
at if it's abundant.

Jerry Baker