Help! Today I went to see my plants (they’re approx 2 months into veg, they’re photos) and I noticed that one of them have this weird yellow spots, I don’t know if it’s nutrient burn (I feed all four plants the same) or it’s a fungi. My temps are mostly on point, same goes with humidity, it stays in a range between 60% and 80% (obviously it doesn’t stay much time above 75%, it’s usually only the most humid days), I water and feed them once a week usually, and I never go over the recommended amount that the manufacturer stats.
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Looks like the start of a CalMag deficiency.
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Oh, I see it, did some research and it looks like that, I was scared because I had in my tent one plant of a friend, and one of them had this spots. But he used regular dirt from the ground, not soil, and I’m not feeding any nutrients to them.
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Cal/mag like @Newt said
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I would start if not already using cal-mag about 6 ml per gallon on water day . Watch the new growth for improvement. Good luck 
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Thank you all! Forreal, I’m gonna buy a CalMag bottle today. Good luck!
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