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Why does KH drop?

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

Why would the KH drop? Is the substrate stabilizing or something?