Man I have a really bad love hate relationship with BioCanna. I get tired of it try something else, then dial it in a little further. I have been having some pH issues with build up. Don't forget your lime, lol... That stuff makes it so much easier. I had some that started to lock up and I top dress lime and just did a watering, and I came back an hour later, and the leaves were high to the sky. Things look to be okay, but I still had some that were further in flower that took a big hit, they look like they will be okay though. Thinking of pHing it with EJ pH up during the first few weeks of flower as this is the time that it normally starts to act up, though using some more lime at the beginning has helped also.