I personally like to know I have a problem before I fix it. Every bag of OF I've tested has had pH in the mid 6's. I don't assume it will be in the mid 6's every time, so I do check it before I start a grow. But, if it's already right because Fox Farm somehow got lucky and put the right amount of lime in to begin with, it seems that adding more lime could undo an already good thing.
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