Stealth MiniGrow - Green Tiger

Hey guys, I will try to keep a more frequent rhythm of photos, notes and comments during the week. I believe it is better to identify problems The plant started to show some problems in its leaves. The low leaves began to yellow, get mottled, and twist. On uppermost leaves (new growth) scorched tips and edge burns. There is also some yellowing in top leaves. Unfortunately I can't say what caused the issue, if it was too much water or too much nutrients or too little nutrients. The water PH is always between 6-7 so I believe that is not the problem. I took the opportunity to carry out another topping pruning and also an LST. Since my growbox is small I will try to branch as much as possible to improve my harvest. But first I need to identify and solve the cause of the problems in the leaves. Oh, I can also say that it already has a slight smell coming from the plant!