Hello. I have two plants (Afghan). Im growing in my basement so the conditions aren't the best. It's a little bit old and the humidity is pretty high so it grows slowly (they are one month old). But one of my plants ins kinda yellow. You can't see it well on that pic.

But in the comparison with the other plant it looks very bright and kinda yellowish.

DId I gave her to much water or did I vertilize to much? (I only did it twice) The other plant also got like this dry yellow edge on a lower leafe.

And can I water when its in the dark periode? I thought light for a few seconds doesn't hurt them.
It's hard to tell in the pics but may have a pH problem with a little to much wind. Check for pests.