Finally legal in Germany - My first grow

I’m seeing two things right now with the plant. The yellowing of the older leaf is a result of Nitrogen deficiency. This should not happen till late into flower. Might want to give a dose of Nitrogen to your plant now while you are still in early flower stage. The brown spots look like the start of a Calcium Deficiency and can easily be corrected by using a CalMag product. Follow the manufacture recommendations for using and you should stop seeing them. I hope this helps.

That is due to temperatures dropping to sub 68F or genetics. Fall/autumn colors just as you see in tres outside. So, this wasn't caused by nutrient issues. If you had any other symptoms do consider those, but otherwise resume normal fertigation before it runs out of building blocks for growth. no worries, i've seen significantly more decimated canopies on plants that continue to develop and finish their buds. Any negative impact is probably imperceivable if you get it back on track.