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I running about 1500watts hps with a ph at 5.8 Im using gh solution. I have a ppm meter and it reads between 800 -1000ppm. New growth has yellowing tips I dont know whats up, I think its some kind of defieciency but I lack the literature as someone stole all my good reference books but If...

The plants are about 4 weeks from rooted clones. There about 11inches in height, Im growing deep water cluture with gh. I use half solution due to prior nut burn problems. However it still looks like nut burn but they were ok until recently. The tips on new growth are yellowing. Some lower...