Help! What is happening to my seedling?

Possibly light burn if it started in the center of leaves and moved outward, move it around if it's under a hot spot on your light that could cause it. Lots of other reasons but if it's the only 1 out of 7 and nothing else has been done differently than I'd guess it's lighting.

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if your reusing soil this will occur! it seems as if your soil mix is to hot (overloaded with nutrients). Id say transplant as carefully as possible in some Ocean forrest potting soil or even coco loco potting soil from fox farm Good Luck and don't feed and nutes for about 3 weeks afterwards.

Das ist ein Nährsoffbrand, das Substrat und oder Dein Wasser sind zu "heiß". In den ersten Wochen vertragen Sämlinge keinerlei Nährstoffe. Also mit ungedüngter Anzuchterde arbeiten und nur mit reinem, PH angepasstem, Wasser gießen. Viel Glück!

I think that brand of peat moss is fortified with nutrients for baskets is it not? Check its back label and fine print. the medium maybe to hot for it. It also says 200ppm in your diary? are you feeding them with anything? Should not need anything at this point. Good Luck.

Roberts said, "I would guess your ph might be wrong in substrate" Hmm, that is something I didn't check. I checked the PPM in the water and it was 198 PPM in water pail, and 175 PPM in the run off when I was watering all these.

I would guess your ph might be wrong in substrate

Weird. Some seedling just don’t make it man.. it’ll probably die off or grow super slow. I’d watch it for 2-3 days and see if anything gets better but my guess is she’s a gonner

She overdried ??? Your grow medium even have a gap to pot ... Went too dry and burned roots and is dieing now ??? My guess... Good luck !