Super lemon haze

Its not a deficiency it looks a lot more like over feeding possibly from salt build up in the soil

Honestly with out a diary and the full setup specs I don't think your going to get much of an answer other then shots in the dark. The only thing I can see for sure from these two pics is they are super lengthy and weak looking, I know that's caused by not enough light density. Don't know how much of that can be corrected from lowering the light now as the plants already grown out and start flowering. the dead leaves in the second bucket point to long term nutrient issues or watering issues like I first suspected. Best of luck.

I have been in your boat recently. In my case it was : 1. Quick average temp drop down by 5 cel , because outside went totally frosty 2. Bought new fans and fresher motors brings more wind, took protective covers off and even smallest setting was pushing them nuts. 3. One strain has huge nute intolerance 4. High humidity and low temps not working in VPD charts and I saw it life. Girls stopped drinking and growing 5. In last watering I increased amount and when all above happend i mini drawned my roots. In your case it's simple. You buster your pH, by either watering on wet or not following it strictly. Few plain waterings, then half feed and slowly they should bounce back. My all troubles were in Ssedmans run, check it. I had one exception, when damaged plant become record breaker, so you can nurse with some TLC and love. That happend in Auto insanity 1 diary. Girl ended up 240 g in soil beeing auto. Hope you will sort it out ! All the Best !