Dark Spots, worried!

Hey! New to growing, starting this baby off from seed. Don't even know if its Male of Female. I'm growing outside in a 5 gal pot in FF Happy Frog Soil. Just started giving it nutes slowly... But I noticed dark spots on one or two of the leaves. And on one leaf, it looks slightly burned. I attached 8 pics, I was hoping to get an experts opinion. I have a bottle of Serenade Garden Disease Control which is completely organic, wondering if I should treat it. Thank you so much in advance!
 

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