One of the great things about building a nice healthy living organic soil is the soil will give the plants just what they need. You don't have to worry about over ferting and screwing up your girls.

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yeah, thats a nut burn. You also can add some more lights. That wont do anything bad. In my growing room right now is 10% hum. The plants are looking good and doing great. I also saw that if the hum is low, than you'll have more resin, the same like JORDISGARDEN said. I saw my plants with more tricomes than usual so I agree, low hum is not bad. Prob is better because the low risk of mold