Yellow Brown Fan leaves

Possibly a fungal problem due to too high humidity. Cannabis does not need extra humidity, it is not a rain forest plant. Google "septoria", this may provide answers. I don't know how you would check the roots. True nutrient "lock out" does not occur unless your soil/substrate is below 5.5 or above 7.5. This problem has nothing to do with being root bound either. Hope this helps,.......... Organoman.

Looks like light stress is part of the problem. Also that back vent should be open esp. when lights are on. Plants need constant airflow around them. You can get some passive airflow if you open that back vent to allow your exhaust to draw air in around the plant. It is difficult to say what else could be causing the discolored, blotchy leaves without more info such as nutrients, ambient temps, light intensity etc. Could be pH issue as well.

How big is your container? I had similar looking problem in late stages, only had a 3 gallon container and ended up root bound.

Hi mate, I would check the condition of your roots. Could be late stage nutrient lockout as I can see calcium (dark spots) and magnesium deficiencies. Those are the first to show up with a lockout. Not really sure where to guide you as I was so close to harvest I didn't sort it. Maybe you're over watering/ too frequently. Not letting roots dry enough. I don't know. Check the obvious things like ph and ec but beyond that it's possibly your roots.

Recommend u check for gnats and ph