Hello, this is my first grow: hindu kush, 41 days from sprout, feeding Advanced Nutes, ph 6.5, 18/6. I see these brown spots on top of the leaf. I this maganese nutrient deficiency or pest? i do not see holes or webbing. Your expertise and advise is appreciated! what advise can you give to help stop the calcium deposits from humidifier water? it lands on the plant and i'm constantly bushing it off. the spotting problem is not wide spread thank goodness but need to stop it.
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Do you use cal-mag and have you moved the light closer recently ?