Hi guys, I have a plant growing in a 5gallon DWC bucket with hydroton clay pebbles in my net pot and 2 LARGE airstones in the bucket. Growing under 8 x 2ft T5 HO Flourescents, (Lights running 24/7 for Veg) I'm running my GH drip-ring 24hrs a day for the entire length of the grow. She's about 4.5 weeks old from seed. THC Bomb Feminized from Bomb Seeds. Some of her leaves are twisting quite a bit as they grow and this week some yellow spots have developed on her that are now turning brown. I'm using distilled water, with 1ml/gal of GH Rapid Start, and adding CaliMagic to bring the solution to about 200ppm total. Haven't been able to get an accurate read of PH yet, waiting for my new PH tester to come in. Any idea's what's causing this? Plz see the pics below, and thank you for all input!
This looks to be like a nutrient lock out, which nutrient I am not sure. At 200ppm that really isn't much so you have a PPM meter and not a PH meter? It is pretty hard to feed your babies if you don't have the proper PH. Get that meter! I think you will find your problem is PH related. Almost looks a little like heat stress too, but I can't be sure.