Growing in 40l rdwc. I need someone who knows dwc first hand to tell me how to feed these plants. I'm using growzilla a&b NPK 28.5.30. they recommend 1000ppm. i also have canna aqua for flower. You can see they go from overwatered, to healthy, then a bad mag deficiency, and now. Here are pics in order from week 3, 4, 5, 6, and now (6 1/2) What is this deficiency. The tips turn brown first, then the sides. I have two 6 1/2 week old plants from seed that look 2 weeks old. Once they dryed out and recovered from overwatering i added 100ppm @ph6.0 grow nutrients and they grew nicely for about 5 days, then magnesium deficiency started showing in the leaf stems. I tried increasing and lowering ppm to correct it but didn't notice anything happening and mag deficiency was starting to show on the leaf surface so i put plain ph'd water in and left for a day, then added 50 ppm nutes (+66ppm tap water).They started recovering a few days ago after foliar spraying with epsom salts. After taking care of the mag problem but i can still see one deficiency developing and they are barely growing. My ppm's don't seem to move, i added 50ppm nutes 2 days ago and it's still hovering around 119ppm. That's the main thing i don't understand, surely at this low ppm the numbers should be decreasing. I've considered the nutrient balace (npk ect) but there was another guy who grew a pound plant under 600w with this brand and not much else. Info: I fill with 40l of water 30ml h202 twice during the week 10ml growzilla a&b NPK 28.5.30 water is kept below 20C with diy chiller on for 15 min every 4 hours, sometimes it goes over but i have an aquarium temperature controller in the mail.