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KH levels

>What do you consider the ideal kh for a planted tank?  What is the 
>acceptable range?

I f you want to inject supplemental CO2 3 is about as low as it is safe to
go.  You can go a little lower without supplemental CO2, but some hardwater
plants won't do as well in water this soft.  If you are injecting CO2,
anything between 3-8 is _easily_ handled.  Above 8, I'd still try not to
monkey with the water unless the plants proved that I really needed to.