Brown parts on more and more leafes

High weefi, I am not familiaire with AACT but when I look at your diary then you can see that they were really healthy till they switched to flowering. That does tell me that the AACT contains too much Nitrogen (N). So my advice would be stop with AACT and add the 1 loter with banana extract to add more Potassium (K) and cal-mag. And you really want to add Phosphorus (P) into this nutrient solution because (P) helps the plant to develop the buds. You can make it by using coffee ground and the best part is that the coffee groud also provide you with enough Nitrogen (N) so that you do not need the AACT anymore from now on. You can also use a PK- Booster instead of the homemade products. It is waaay easier to regulate and there are also organic options. Happy Growing Buddy! 💚