Hey guys, i have just started to notice this on the big fan leaves. Any idea as to what's wrong, thanks!
400W HPS, promix soil, foxfarm nutrients, lights are 18inch from canopy, temps have been 70-80F, humidity 30-40% (a little on the dry side)
One thing I worry about is pH since I have only been using tap water and haven't been adding any PH down (did a great grow without adjusting PH so I've been lazy with this one in that respect). Oh yeah, I'm growing feminized "ICE" from femaleseeds.