I think my plants would thrive better in a higher KH

I just set up a new one that has cycled for 4 weeks. I am running CO2

TDS: 220
PH tap: 7.8
PH under CO2: 6.6
PH aquarium: 7.0-7.2
Phosphates: .25
GH: 6 dGH
KH: 2 dKH(i think is my problem)

Almost all plants prefer lower KH. The lower the better. Raising KH will only make things more difficult.

If you want help, you should list more information about the tank and some pictures.

Why would you think that?

I'm not asking in a bad way. I'm genuinely curious, with all the info out there on planted tanks, as to why kh would be the parameter you are most concerned about?

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Hi @AJR930,

Carbonates are 'basic' (as opposed to 'acidic') so any addition of carbonates to my water will have the effect of increasing my pH. Your water is relatively soft, possibly you mean that you want to increase the amount of calcium or magnesium (which is what a GH test kit measures) in your tank? Regrettably the water districts I checked on Cape Code do not indicate the levels of calcium or magnesium in your water but I would suspect that most of that 6.0 dGH is calcium and are very low on magnesium (which is common in most water supplies). It is possible to increase your dGH without effecting your carbonates and pH but not your dKH. Hope this helps! -Roy