I’m new here so go easy on me. I’ve been trying to grow my own plants as a bit of a hobby, I wanted to keep it as basic as possible, and don’t have the option of outdoor growth.
Very quick background, I have a grow tent (24x24x55") with a grow light (1200W model with 230W actual power, 120PCS LED), an exhaust fan at the top and an oscillating fan down the bottom (usually aimed quite low, I was afraid of the soil retaining too much moisture and getting mouldy).
I’ve had one round of plants that went ok, but a bit sick looking towards the end, and now my new plants are doing the same but seemingly earlier in the process (images below). In the interest of simplicity I wasn’t using any nutrients (I’m not hugely bothered by maximum yield at this point), just sticking to a light schedule (18/6) and standard watering. Not sure of strain because where I am it’s just take what you can get haha.
After seeing the issues with my plants currently I’ve tried a few things but I’m in need of some help determining the exact problem. I’ve had issues with fungus gnats with my other plants and thought this may be the issue, so I’ve done some neem oil soil drenches (after these issues started), and while the gnats appear to have gone, it hasn’t fixed the plants. I then thought perhaps nutrient issues, so I bought some basic flower nutrients just for a small boost (again I know this is a complicated topic but I was hoping to keep things simple initially). I’ve tested the water PH and it’s a little high but I’m not sure if it would have this sort of impact, possibly worsening over time?
My current thought is that they may have outgrown their pots (the largest is in a cloth pot, 9.5inch diameter, 8.5inches tall), or the nutrients/PH are causing real issues.
I haven’t been able to identify because some leaves appear healthier (with no apparent correlation between their newness and the damage), but others get discoloured, sometimes droopy and thin, then yellow, then crispy and brown and curl up. Other thoughts are light burn and wind burn but these don’t seem consistent with where the lights or fan are.
Photos below for reference, thanks in advance for any advice.