likes to smell trees.
ah, i just looked at the first couple of pics you put up on page 1, Cap, and that shows the air lines more clearly. also, it appears as if you've still got drippers on this rig, which i thought you had eliminated (that's the second pvc pipe on the above pic)?
for others: many of us experienced stem rot issues with the top feed component that DD ran continuously. my solution is to top feed by hand when i put the plants in, the high rh coming up from the bucket typically has the roots reaching into the water four days later. i let the roots establish for a week or so and then uncover my rockwool cube and gently pull off about the top 1" of rockwool so that my lower stems can stay dry from that point on.
EDIT: LOL, and it appears as if you can post pics much faster than i can type Cap!
Yeah the drippers are there, but there is no pump attached to them anymore. I prefer to handwater for the first week or two, and after that I no longer need to water. The roots wick the water up. I will feed tea to the crown as well once a week, and that seems to be more than enough to keep the top bucket moist.
I think I want to try only having holes on the bottom third of the bucket, and raising the water level to above the holes at all times. After reading through some of heaths posts, it seems that the best bet is to have the roots going straight to the water with no air gap at all, to avoid large cord roots and promote only small feeder roots. I actually think that this is one of the secrets to heaths success, is all of the roots being fine feeder roots.