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Nothing jumps out at me, what's your pH, and what was your ppm when feed. At that growth 1/4 nutes is a lot so be careful
DWC calls for 5.5 to 6.5 you should let her pH drift up as it will naturally. BC different nutes get absorbed at different pH
It looks like your hydroton is to low and it is letting light into your tank.
The hydroton is low, and could let light into the reservoir. Sink a plant down in a pot like that and it's hard to circulate air around it too. Next time fill the net pot to the top with the hydroton. As for the bottom leaf...everytime I grow something that stacks nodes real tight, and the bottom leaf lays on the hydroton, that leaf dies. The spots on leaves are probably from pH swings. Almost mind numbing to try and keep it in check with the test strips. Get a test pen, and calibration solutions. Yes the calibration solutions are mandatory...use them. Otherwise you might as well keep the test strips.
Good luck !