looks like mold to me....id get a second/third opinion tho....so here we go, i have a 16inch Og herojuana girl and she is on day 22 of flower and i noticed this on her fan leaves. is this bad for her.
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yes all day, is that good or badDo you have a ocscilating fan on it 24/7 ?
Watered down! (That's the kind of mistake I'd make...neat bleach, doh!)and before your next grow make sure to spray everything with bleach first