I seem to be running into the same issue with mid/lower leaves fading, turning yellow from the tips in on nearly every grow. See photo. Looking for some advice as to what might be going on.
Backstory: First run soil. 1 gal. pots. Three strains - Purple Satellite, Panama and Harlequin CBD. Day 27 from seed. Under 660W actual LED, 18/6. Day temps 78-82, Hum. 55-65% Both lower at night. Not every plant is showing this but most are. I'm feeding each strain separately (nute strength) per the breeder.
Researching the issue leads me to either a N or Mg deficincy. However, on a previous grow with the same looking issue, Doc recommended up canning them as they looked "root bound". I did and they improved quickly. I pulled a plant today and there are a lot of roots circling etc., but I've had em thicker. Also, there are a few plants that appear to have "stalled" - growth slowed down.
I was hoping to go another 10 days or so before transplanting. The PS are getting a soaking, double drench every three days. The others every four. I'm following the feeding chart cycle, foliars, etc..
Not all leaves have the brown spots (nute burn?) you'll see in the attached pic. Most just show the fade-to-yellow in the leaf lobes. PS - the purple stem is "normal" for the Purple Satellite.
Any advice will be appreciated.