What should the water's pH be?

Here is a PH chart for you. I use PH up and PH down to adjust.

boneman-72747-albums-kali-mist-columbain-red-haze-picture819365-ph-chart.gif
 
Here is a PH chart for you. I use PH up and PH down to adjust.

boneman-98489-albums-kali-mist-columbain-red-haze-picture819365-ph-chart.gif


OKay. So, once I get the pH controlled, I will begin to pH my water to be exactly 6.50.

However, my one question is this. Although it seems that a slightly lower pH such as 6.3 will not allow much room for Mg, C, and P, is this a wise choice to lower the pH from 6.78 to 6.5? Should I use a little under 6.5 like 6.4 or 6.4 to get it down and then from there use 6.5?
 
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