Tuberous seedlings w/brown between leaf veins, curling?
I've got a dozen "Illumination Salmon" babies from seed started in December. They were just starting to grow like they meant it and get multiple stems when the leaves started looking odd on most of them. A couple seem unaffected so far.
I don't have a working camera so can't post pics. I see two things going on. Some of the plants have dry-looking brown patches between the leaf veins, mostly on the uppermost leaves. The leaf edges are not dried out.
Several plants have leaves curling under at the edges, and new growth is oddly lumpy and distorted. A couple seedlings have both the brown patches and the curling. The other affected plants have one problem or the other. I cut the worst bits off and wiped the snips with alcohol-based hand sanitizer between cuts.
I've got them indoors under shop lights with T12 bulbs. Plants are in individual pots on a tray. Pots are 2 1/2" square, 3 1/2" deep. Plants are varying sizes, all less than 5" tall. Can young plants sunburn under fluorescent lights? I moved them a few inches further from the lights in case that was it. Could it be dry indoor air? We have forced-air heating, with the vents in the ceiling. Am I messing up watering? Or is this some sort of pest or disease?
I've tried to find answers online but still don't know what I'm looking at. Hope someone can make a better guess than me, maybe point me to some online pictures to compare.