my normal tap ph is 7-7.2 i try to get 6.6-6.8 with co2 but i must have over done it i built myself one of those inline defusers out of pvc although it is a solid color so i cant see in but i can hear that there is co2 in it most of the time then i use an ehime 2213 filter. my tap KH is 10-20ppm but for some reason bith my plant tanks are up to a kh70-90ppm i dont even add any thing in the water to rais it up only thing i can think of that wodl is the posattiun sulfat i use at 1 teaspoon 2x per week so i am going to kut it bak to 1x per week.
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