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You will get a better response from our resident weed doctors if you post in the Infirmary section. That being said and bear in mind I'm no expert I would lean towards PH problem causing nutrient lock out......simple pool PH kit can be had from hardware stores fairly cheaply. When I used it I aimed for 6 and did pretty well.....................Water quality is a big factor to healthy autos, what type of water are you using ( tap from city, tap from well, Spring water, RO water, distilled?)....My first grow started looking similar with issues, it was determined my water ( tap from a well from a limestone aquifer was the problem...high in calcium and PH) I switched to store bought RO - Distilled ( read the labels to find out the source) and got a pool test kit and saved the grow.