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what could this be?

im at 75-84% humidity and 22-25 deg c with a ph of 6.5-6.9

what could this be? 

i see leafs curling and in starting to worry

i used coco and biobizz light mix and fed thwm only once

week 3.5

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Replies (7)
    • light is at 30 inches at 40% so at around 300 watts

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      • ive see this before on one leaf or two from time to time and just let it roll.

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        • i think its either oxygen starvation to the roots or else it could be wind burn

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        • I have always thought it was from over watering.i have one seedling of Master kush with this same issue now so I be interested in what it may be

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          • nothing to worry about, this can happen once in a while depending phenotype

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            • i would say a PH at 6.9 is very high n coco i am using 5.7~6.2 but your plant looks good so throw that out the window let me know what u find out my friend .....

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              • I completely agree with King! I try to keep my plants under 6.0 the entire grow.

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