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Wow thanks for all the replies. The general consensus that I'm getting here is that I shouldn't be testing the pH if my soil? I was under the impression that soil pH should be 6.5 and that to much higher or lower than that can cause nutrient lockout... I guess I should concentrate more on how...

I'm sorry, my fault. TEASPOON of CalMag per gallon, as per directions on the bottle.

How much does Cal-Mag raise the pH? I didn't realize it raised it by much. I've never heard of sphagnum peat. I'll check it out. How quickly does it lower the pH? Is this something that needs to be added in the mixing stage, or can you add it as a supplement to an existing grow?

Details about the grow: 4x4x6 tent 1000W HPS light, running %75, recently lowered to about 21" above plants. AC Unit set to go off at 75 Temps have been between 68-78F (20-25C) Humidity between 35%-60% RO Water pH 6.0 with CalMag 1tbs/gallon. No neuts yet. Recently transplanted from 4" pots...