Since your res is positive pressure, if there was perlite in the coco do you think that would have helped to push O2 up thru the media and prevent this?
I think it was wet, very high temp, not sterile or live until just recently, did not keep the bottoms cleaned up for air flow and had poor airflow over the pots…
im sure all of those contributed but majorly was not running bacteria while running very high temps and not pulling the humid air away from the base of the stem.
Those little white nubs are actually roots forming and that tells me the moisture in the air just above the coco was waaaay to high