So I didn’t notice this before, but my buddy gave me some plants and a couple Crecer Panthrs so I put my few little plants under them. This COULDVE POTENTIALLY happened before I used different lights but I doubt it.
Looks like it could be light scorching. Have you raised them a bit? I had to raise my little LED tonight as they looked like they were going the way yours are.
They look like they are growing fairly rapidly so doesn't seem much harm was done.
You want to know for sure if it's a deficiency or just light damage? Just snip off all the damaged portions and if it reappears on other leaves then it's likely a deficiency. If not then you just scorched her a bit.
Is it the same strain as the other 4? If different it might have it's own issues to suss out.