Waterchanges add a lot of co2. The problem you will find is at equilibrium, the water will contain 3-5%. The CO2 from the waterchages either gets used fby the plants and or gets outgassed by surface agitation till it reaches equilibrium again. Your ph problems aren't due to CO2 loss. There just isn't that much in there to begin with to alter your PH that much. Look for other causes like an substrate that isn't inert or rocks. Limestone and coral will cause your ph to rise.
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