I may be missing it, but I don’t see anything alarming.
Likely just a touch of nute burn. Commonly called “painting her nails”. It shows the plant is receiving maximum usable nutrients plus some. It is considered desirable if you can maintain that balance on the edge. 
Also since it is beginning to flower, you probably should reduce the nitrogen and increase potassium and phosphorous. The dark green is indicator of nitrogen toxicity.
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It’s a fine line to walk 
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I’m using ff trio which one do I reduce to stop nitrogen build up