Listen to bk78……..ya dude that 1200ppm should be at 600ppms…… also keep your pH from start to finish between 5.8 and 6.2 one day 5.8 next day 5.9 day after that 6.0 and 6.1 and 6.2 after that bring it back down to 5.8 and restart the cycle every day bring it up .1 this will keep your pH moving around and giving the plant and opportunity to take up everything that it needs under prime conditions…… also lift the lights up plants that are locked out nine times out of 10 they’re locked out of multiple nutrients Cal mag amongst other lockouts reduce the plants ability to withstand high intensity light which is why a lot of people with bad lockouts for the plants get crusty leaves and tacos…… if it were me add flush them all with 600 ppm feed until I saw seven or 800 ppm runoff then go 2 days let them root search that pot then repeat that proses untill their light after 24 hrs of no feed…… once that happens bump it up to twice a day that’s how you get Coco to perform how wants to you got a let them root out that pot…… The thing with Coco is you don’t need crazy strong feet there’s no buffering in Coco so what ever you give them they’re going to take up almost immediately especially when their rooted out…. Very important that you learn and observe, when and how often to feed coco when their not rooted out in their pots…… I don’t care what anybody says you can definitely overwater a plant that’s growing in coco….. I have ran into root rot damn near every grow when I first started in Coco….. One because my reservoir hung around 75 to 80°F and I didn’t know any better at the time add 2. I was watering plants multiple times a day that were nowhere near rooted out…. You’ll get there no worries any more problems reach out someone out here will help you…..
