Are the yellowing dry leaves from too much nitrogen or something else?
Welcome to the forum.
Are you measuring and managing runoff PPM and pH? If so, what are the current measurements? I expect that your pH is low and your PPM is high.
No runoff it’s a loop with a tank but ph is 6.4 ppm is 1600
Hydro or DWC?
Hydro. It’s in expanded clay balls with constant water flo from the top. 6 inches expanded clay then 18 inches air 2 inches of water pools at the bottom before it gravity feeds back to the tank.
Your target pH is 5.8. A pH above 6.2 in hydro risks lockout of potassium, phosphorous, calcium, manganese, iron, and boron.
Your PPM is a little high.
Thanks I appreciate it.