Help with seedlings, first leaves turning yellow

Seeds started in rw and transplated into the net pots in the 1st.

lamp: Mars ts1000 lamp at 25%.
water: 10gal total (9gal distilled, 1gal filtered tap)
Nutes: gh flora, 10ml ea, 200ppm
pH: 6.1
Water temp: 68-72
Tent temp: 76
Rh: 45

leaves on one place has been a bit light colored but that plant grew more. The other one was greener but seemed to grow slightly slower. Both had signs of too much water yesterday, with leaves appearing heavy and curved down, so I lowered the water level from 1/2” above bottom of the netpots to about 1” below last night. Splashing from the waterfall is keeping the hydroton wet as shown in the pics. Plenty of water flowing from 400gph pump recirculating the nutes. Added 50ml of 3% h2o2 last night as well (have been adding this amount every 2-3 days).
After lowering the water level, the leaves started getting yellow on the quicker growing plant and looks to be starting to yellow on the other. Should I raise the water back up??
No change in ppm. Ph went up only 0.2 over the past 24hrs

You may have to top feed them for a week or so, her roots haven't even got through the net pot much less touching your solution. I'm guessing they're thirsty, or the paradox of overwatering. I was talking to another member here and when he buried his rock wool in hydroton, his girl looked a lot like yours. We was watering her from the top but none of the water made it to his cube. So the hydroton was wet but the cube was dry. Just a possibility.

Johiem said:

You may have to top feed them for a week or so, her roots haven't even got through the net pot much less touching your solution. I'm guessing they're thirsty, or the paradox of overwatering. I was talking to another member here and when he buried his rock wool in hydroton, his girl looked a lot like yours. We was watering her from the top but none of the water made it to his cube. So the hydroton was wet but the cube was dry. Just a possibility.

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Hmmm I’ll remove some hydroton and take a look. My cube should be just at the water line though, and there were a few 1cm lengths of roots sticking out when i transplanted.
Going to raise water level and throw some more air stones in there for now and see what happens.

Cubes were still pretty damp and she’s definitely growing out roots. Just not past the nets. I’ll check back tomorrow morning and see how she’s doing

Any possibility my nutes are too weak or perhaps a light issue?

Not that young. your 200ppm should be fine for her once she gets there.

Don’t look and better this morning. What could be the problem? Roots are touching water, lights are at 25%. I’ll lower ph to 5.6 today and check after work.