Brown Spots on the Leaves

Hello for me it is a potassium deficience because the way your leaves are rolling on itself with this yellowing and brown spots it is characteristic from potassium deficience. Measure the ph of the drain when your water your plant then correct it if it needs. Good luck.

Hi there Wejder, that looks like a pH related issue that is caused by something happening in the root zone. I see you're watering at 6.5 but you should be watering around 6.0 max ... One question i always like to ask people is "what is the pH of rain water?" . So there are problems in the root zone as you can see from the downward pointing leaf tips. Right now you are adding NPK & micro , but to fix the problem roots you need to add some kind of additive like beneficial bacteria which take a long time to act, or humic acid if you're in soil or fluvic acid if you're in coco. If you do these simple things the problem should start spreading almost immediately and the plant will recover in 5 days to a week. Hope this helps ! 🚀

Looks to me like you have a potassium deficiency and and magnesium deficiency. As with all deficiency signs make sure ph of substrate is in range for growth and if so then increase those nutrition, also I see nitrogen toxicity in background on one picture. Reduce nitrogen levels greatly in flowering if possible. Good luck and happy growing 🌱