Tweezerstarted grow question 4 years ago 1st ever grow, Sour D. AUTO. Coco/drain to waste. Switch from GH koolblum bulking 0-10-10 to GH koolbloom ripening 2-45-28? Says to switch for the last 1-2 weeks of flower, this would be in addition to calmag and maxibloom for base/micronutrients. Thank you for any and all input!