Co se děje s listy?

looks fine, look like the genetic you can see the color also on the area where the stem connect with the leaf 🍃 , if it was cold you will see it on the other plants. so just keep them warm, and keep the good work they look healthy 😊

is it a red/pink hue? if so that's senescence / fall colors -- could be genetics or 68F and below temperatures at night. if not, would want to see a bit more progression or other info as interveinal symptoms are not discete to one cause.