My soil is 6.8 and my tap water is 7.0. So I should lower my ph to around 6.0 using tab water and ph down? Is this right? My soil should be at about 6 or lower, or my run off should be about 6.0 Does it make that much of a difference going from 6.8 to like 6.0 ph or 5.7 ph? Or is 6.8 fine? Thanks. Cav