Hello everyone, What's the best ppm CO2 level for a planted tank? Also, when trying to use the CO2 charts, and calculators, my test kit measures "ppm total hardness". Is this the same as KH ? GH? Or can I convert it? Thanks, -Chrys "and i try to laugh at whatever life brings cuz when i look down i just miss all the good stuff when i look up i just trip over things" ~ Ani DiFranco