my goodness there is a lot of confusion. if you add vinegar, lemon juice, baking soda, whatever it will solve you ph..for the moment. you are basically procrastinating a larger problem. what you should do is get some oyster shells. that will last a while. if you need calcium right now foliar spray a water and molasses mix (blackstrap is a good source of calcium), or boil down some egg shells 1/4 a cup per gallon. if you need magnesium i suggest using better vermicompost in your next grow, but for now for some epsom salts or sul-po-mag. calcium and magnesium are the major components in buffering the pH of your soil. not saying that trace minerals aren't important, but you got to get down the two key ones first. good luck on ya.