Flecken an Blättern

Hello mate, looking your plants i think you have a K excees, because you have a green light new sprouts and you begin to have Ca-Mg-Zn-Fe; This issue could be caused by a pH fluctuation or by Ca locked out in the soil. Good luck and happy journey!!

I reckon that's where you've spilt a little nutrient juice. Nothing to worry about, double check the underside for insect damage.

Yeah, it also looks like over-fertilization to me.

These could be the first signs of nutrient overload. I would remove the 2 leaves for aesthetic reasons and skip adding fertilizer a few times when watering. The leaf discoloration has nothing to do with pests. Otherwise, the plants look perfectly fine. Grow on…

Hey there looks like you gave the plant to much nutrients. You need to let the plant grow some of those leaves out to full size. Your plant will never grow quickly with only really small leaves

Doesn't look like thrips, more like a slight magnesium or calcium deficiency, or maybe some old leaf spots from water droplets or light stress. Since it only affects one or two leaves, I wouldn't worry too much. When you water next time, add some Cal-Mag and keep an eye on whether it spreads. The new growth looks healthy.

Looks like low P symptoms. either low on P or something locking P out... deductive reasoning can eliminate possibilities.

Deficiency, not a bug.

P deficiency