The 2 SGO look burnt, and the ones above and to the right look slightly burnt too.
I use fish at that stage. (Very dilute. Just a few drops in a pint. Enough to lower the pH of distilled water.)
But I usually play it cautious.
Is that algae?
Probably you want to have them closer to the light. Whether that means raising the seedlings or lowering the lamp.
Also, I would slide the seed coat off those cotyledons. It's pretty easy if you hold the leaves with one hand and the pull the casing away with the other hand.
Hey thanks Dog. It's all gravy down here. Fairly steady at 65-85F. They're all flowering and starting to set fruit; each at their own pace. I've noticed some stretch. There's been some blossom drop too. I just started giving them espoma garden tone 3-4-4. Still feeding full strength fish and...
They look good. I would not pot up. Just wait until transplant, and plug them into the Earth. I would drive stakes into the planting holes first. Then set your plants right next to the poles and backfill with soil. Lash them to the stake with some garden ties to keep them from flopping over.
:neutral: Sulfur deficiency: all the leaves on the plant are light green.
Yours looks more like only the new growth is pale. That is more like iron deficiency (pH too high).
Probably it's just from overwatering (the new growth is light colored and the veins of older leaves).
It looks like the...