GMSgrowsanswered grow question 4 years ago RO is best because you know what you're feeding your girls. Your soiless not hydroponics. Its a form of hydroponics but hydroponics is in water, clay pebbles, rockwool etc. Best to change your info to soiless so people know how to help you. Coco and promix is soiless medium. Coco you will need to add cal/mg promix you don't. Only add cal/mg if you see they need it. Coco you feed feed feed water, promix is feed Monday, water next time when dry, etc. When you switch to flower time 12 12, you should keep ph at veg levels and when you see pistols forming is when you go to 6.0 to 6.3 ph. Cheers friend