Yellow leaves

Entweder stimmt der Ph Wert nicht oder du hast ein Stickstoff Problem eins von beiden. Ich gehe aber eher von Stickstoff aus

it looks liek somethign is chewing on the leaves.. but the yellowing is more likely nute-realted... 2 problems coexisting. if not in flower, go buy some basic pesticide - pyrethrines are good and break down in a few days. follow instructions. i'd suggest some concentrate from southern AG if in USA. it'l be way cheaper than any ready to spray bottle, which probably won't last until end of your issue. end up paying 10-20x more over time if you do. if you don't have any, get some cheap bag of pippettes off amazon. 3mL or 5mL size is great. watch a vid how to properly use them if having difficulty being precise... suck in to your desired measuremnt, then pull out, let air in, tap air to top of pippete... perfect measurement each time. if yellowing from bottom up on plant, it needs some nitrogen.