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proper KH & Gh ?

I finally found a test kit to give me the above measurements. At a PH of 6.8
I measure a KH of 3 and a GH of 7. I am using CO2 in my planted tank and do
a 25% water change weekly. Are these numbers ok for good plant growth? The
KH seems low from what I've been able to read, any thoughts?
TIA (again!)