GnomesAndStones

@MrT82, Hello :) I got test stripes with 0,25 steps, so it is relatively easy to tell pH precisely. I can't really imagine pH being the problem. To switch or top up the reservoir, I lifted the bucket up with a box I shoved under it and hung strings from the ceiling to hold the lid in place while I lower the bucket. I already bought a PPM meter, my reservoir is at roughly 900ppm. Thanks for the advice! I really appreciate your help

@@MrT82, thanks a lot! I am using pH stripes to avoid any pH meter inaccuracies, so pH shouldn't be the problem here :/ She is having these problems for about 3 weeks now and I already changed the entire reservoir 1,5 weeks ago... PPM got a bit high at times, but I am now cutting back on nutrients and hope it helps. I am pretty sure it is some kind of nutrient burn, because it appears mostly on higher leaves. Thanks again for the advice and please don't hold back if you have another idea :)

Holy shit, what a Giant!! Well done once again :)