Yellow upper leaves

Si, estoy de acuerdo con @Gettawayking!! Felices humos y feliz 420!👌

Die Verfärbung der Blätter schaut nach einem Überschuss von Nährstoffen aus. Möglicherweise durch einen problematischen PH Wert hervorgerufen.

Definitely looks like ph fluctuations, check your runoff ph and see what # it gives you, once you see the ph # it can give you an idea what's the problem. Best of luck 👍 happy 420

Do you have a diary for this grow? That would help us to help you!! The pattern of discoloration seems to indicate a deficiency of boron - really doesn't suggest anything else, to be honest... you could try mixing one teaspoon of boric acid in 4l of water and giving that to her although you may not get those leaves to "green-up". In order to prevent this, don't let her dry out too often and make sure the humidity is well above 25%... boron is an immobile nutrient and the plants can't redistribute it to where it's needed the way they can distribute mobile nutes like nitrogen... If this was my plant, I'd give the boric acid a shot (making sure you ph the solution!). Good luck and Happy 420!