Brown spots on leaves. Week 6/7 of flower.

I'm growing from a fem sour betty from seed in 30 gal smart pot with ffof soil. Using biocanna nutes; Flores, Rhizo, Boost with Raw Kelp at every water. I noticed yesterday that I have aphids and fungus gnats just starting to show up so I got some montery spinosad bug killer that I'm going to spray it with this evening. Last week it was caterpillars so I hit it with BT. This morning I saw some brown spots forming on several fan leaves near the top of the canopy. I also found a seed in a nug but can't locate any male stamens aka bananas.. we had a week of no sun due to the NW burning down so I'm guessing light stress did it. :/ What are these brown spots though? Any ideas?
 
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