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[APD] Re: PH and CO2 questions

Tarah Nyberg wrote
> However, In order to reduce the net amout of CO2 that you need for you
> plants you can also reduce the KH. at a KH of 2-3, (36-50ppm) you will
> need much less CO2 to keep your plants happy. I don't have the chart
> handy, but this should be evident from the chart. 

What? This doesn't make sense to me. Why should the KH have any influence on how much CO2 the plants need? Lowering KH will just lower pH (if CO2 stays contstant) but have no effect on CO2 or the plants CO2 requirements. 

Clint Brearley
Melbourne, Australia

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