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Light is ok 8x42w 6400k cfls for 4 plants, but I think that its calcium deficiency, at least here are the best pics that are similar to my problem: https://www.rollitup.org/marijuana-plant-problems/488004-guide-nutrient-deficiency-toxicity.html

Hi guys! Today I noticed that to one of my NL auto plants have appeared brown leaf tips. Some information: plant is about 3 weeks old, using cfl lighting, temperature is about 80F/26C, using DWC system. If you need any other information, just ask. Btw this is my 1st time grow. :) Thanks.