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[APD] high pH low Kh?

I'm in quite an unusual situation here and would appreciate any help. My aquarium water has a kh of 1, but the pH is 7.2 (GH =3).
1) Any clue why this is so?

2) How do I increase kh in my aquarium without further increasing my pH? I don't have CO2 injection and don't have access to any DIY equipments, so I can't really bubble co2 to get the pH down. How about adding acids to the bicarbonate solution?

3) If I don't have CO2 injection, would having a higher kh have other benefits other than reducing the pH swings? Would more CO2 from fish and the atmosphere be able to dissolve more and therefore increase plant growth?

thank you very much!

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