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Either shore flies or fungus gnats...I had a hell of time recently with those and so I recommend using a product called BT Israelis, or Mozzy bitz for organic gardening. It's an organic bacteria strain that targets flies and there larvae. Also use nematodes in your soil. Those little guys Rock. If these things don't do it you might have to use a pesticide and then I recommend using a product called 8. It will kill some of your beneficial microbes and bacteria but you can always restore those after you get rid of the pests. Good luck and happy growing.

The yellowing on lower leaves is classic Nitrogen deficiency, its moving the N from lower in the plant to the top of the plant. This means its not getting fed enough, i would keep feeding its veg feed till its done stretching. Then mix in the bloom. On the note of stretching, there is a lot of space between nodes, this could be from genetics or it could mean your light is dimmed to low/not close enough. With your feeds, mix em up at the advertised ratios then dilute it down to the desired EC. If you don’t have a ec pen i’d suggest you invest into one, its a useful tool when using liquid nutrients. And always get some run off with liquid nutrients to prevent a buildup of salts in the soil. Good Luck!