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You have nutrition burn. The dried brown tips curling up is the sign. I would apply a light feeding this time with extra water to rinse any salts from prior feedings away. Always give at least enough for a 20 percent run off. Plus check ph at beginning of run off and at end part. A digital ph meter is best. Hopevthus helps and good luck and happy growing. 🌲🌲🌲👊
Looks like some nutrient problems on at least the first two. Do a complete res change if you haven't since the spotting started. Make sure you have calmag. I also like humic acid (diamond nectar) and hydroguard for my DWC. Keep tracking pH and EC to diagnose problems.
Retro23
