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best CO2 level?

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?

"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