I did not have a ph soil pen when I originally mixed my soil for my 3 gallon pots. If i had, I would have added some lime to buffer the ph closer to 7.0. Now that the plants are close to 2 months old and I have a soil PH probe I now know that my soil ph is 5.7. I have been using biocanna nutes in a resovoir and I have PH up and PH down. I also have a bag of calcium carbonate. The last time I watered i adjusted the PH in the rez to 7.1 hoping it would raise the ph of my soil a bit. It did not.(not even a little) I'm thinking next time I water to raise the ph in the rez extra high to like 9.0 or 10.0 hoping to raise the ph in my soil. Is this a good idea or no? I am also thinking of adding a bunch of the powdered calcium carbonate to the rez and watering with that. Is that a good idea? If so how much should I use? A tablespoon per gallon of water? Any help would be greatly appreciated.