The only explanation I can really think of for the massive growth spurt, followed by what was obviously oxygen deprivation at the root zone, must indeed, despite my belive that water temp couldnā??t change so quickly, be water temp razing! All that nice cold tap water that held o2 brilliantly, just must have warmed up (it's my current theory), cheers for suggesting it! Well, I canā??t think of a good and cheap system that would solve that problem; there is a product called oxy-plus, that's meant to increase water o2 levels. By the way, thereā??s a little info on DWC at this link:

Top Tips - The Aero Podā?¢ Professional Deep Water Culture aka The Bubbler

Itā??s pretty well illustrated. Itā??s identical to my setup, although, I didnā??t buy from there.