GMSgrowsanswered grow question 4 years ago In hydroponics you start feeding from the time their born at 400 ppm, 0.8 ec. You increase the feed by 100 ppm 0.2 ec every week if your seeing good growth. By the 5th week your plants should 18 to 36 inches and ready to go into flower.. Dont go overboard on your nutes and if you see your ph creeping, adjust it. Keep your water cool and watch nutes that are to dark. Canna aqua or Dutch nutrient formula are all I would recommend for hydroponics. Dont go more than 1.8 ec,,1.6 to 1.8 should be good. Cheers