check ur Ca ppm could be P,Mg lockout next to be N,K

As 001001 said, could be mechanical damage from hitting the edge of the potter. No need to spray with anything.

Spray neem oil

Looking good actually. There is nothing wrong seeing first leaves looking strange. Nothing to worry about, they vibrate and that's the most important thing. I guess you doing something right :)

Could just be due to being a young plant. Those first sets of leaves almost never stay or look healthy green by the time they’re big ladies, as long as you don’t see spots like those on leaves moving forward it’s probably fine. If you do though, treat for any kind of pest you can

early leaves tend to have blemishes. Could be related to touching/proximity (proximity impacts micro climate around stomata) to the pot rim, too. if new growth is fine i wouldn't worry too much. Plants look on pale side but could be the grow light making them look that way while actually being a healthy lushness. make sure they are a healthy green in normal lighting, otherwise amp up the fertilization slightly.