if its only the ones below the canopy , without more info , i'd be inclined to think light intensity is the problem . not enough or strong enough light getting to the lower half of the plant .
thin out some fan leaves blocking light or spread them out a bit more so more light can get through .
I was also at Claypool's Bucket of Brains @ Bonnaroo! First thing when we arrived! What a bitch getting into the lot! 12 Hours sitting in the ride!
Anyway so you guys still do maxi bloom in veg right? I am seeing 3/4 tsp/gallon for veg..?
Got some thanks!