What’s wrong with my plant

Oh sorry, and lay off your current nutrient feed a bit (like use it at 50% strength maybe).

Throw molasses and a bit of calcium at it if you can (imo).

Just looked at your grow and I agree, I reckon potassium deficiency. Make sure your ph is correct after adding nutrients aswell. Ph perfect range from advanced nutrients will help if you dont have a pen 🌱 happy growing bro

Without a clear pic it's hard to see, from the area its effecting I would say its either potassium or PH fluctuations. I would lean more towards PH fluctuations than potassium, be sure to monitor your PH and give her a little flush, if you are using bottled nutrients make sure they are mixed in the right order as some times that can cause the issues.

Could you take a picture under natural light at it is really hard to make out any problem under a burple light. Thank you