First grow, stress spotted, HELP

don't lisen to him ) 24h for auto is the best schedule

You grew for 6 weeks at 20/4, then went to a week at 18/6 and now a week at 24/0..........and you are wondering why your plant is acting weird?? 18/6 from day one to harvest is optimal. By slowing the plant down to 18/6, then accelerating it into over-drive at 24/0, you have forced it into cannabilizing itself, hence the yellow leaves........it is stripping itself of all available NPK due to being in overdrive. Nothing you can do now to "fix" anyhting, the damage is done and the plant will not magically get better, no matter what you do......there simply isn't enough time before harvest maturity. Be kind to your plant, go back to 18/6 and let her finish with the least amount of stress. Whatever you do, do not cut any leaves off and do not try to "cure" her with strange concoctions of fertilizers. Just continue on at a steady pace as to what you were feeding before, give her 18/6 and let her ride it out.

agree with others. Did tis start at the top, or bottom? The whole plant going yellow in a week is major. Your light distance is where mine is at this stage. Light stress wouldn't do this that quick that I have experienced. She will look this way if you did final flush and only water for two weeks. The sugar leaves are dying also, if there is any sign of cloudy trichomes you may be best to harvest and get what you get. Buds full of dead matter won't taste good. There's a lot of damage to try and recover from.

Da stimmt die Calcium/Stickstoff Kombination nicht. Entweder durch falschen pH ausgesperrt oder durch zu viel/ zu wenig der kombin

Are you 'flushing' the plant for harvest? fyi, does not impact composition of flower, because that's not how plant biology works. This clearly needs some nitrogen... also common for bro science sources to tell you that you don't need much of it in flower despite the plant obviously having a visible deficiency. ensure pH isn't too acidic, but most likely just need more N in your fertilization. If you lowered it or are flushing, you are doing that too soon as the plant obviously still needs building blocks to build molecules - like for cellular division and thca etc... this stuff doesn't come from nothing. law of conservation of mass.

Lightmix is already pre-fertilized and since the nutrient requirement for Autos is not so high, I would almost guess that they are over-fertilized. The burnt leaf edges would also suggest this.

if u're feeding it properly then it's Ca excess and NPK+Mg lockout