Is the water level what you think may be causing they problem?Lower water to about an inch below net pot. You can top feed if you want but shouldn't have to. The bubbles should keep the roots searching for the water
600w MH about 24in ambient temp around 66°What kind of light and how close?
That's way tooo cold!600w MH about 24in ambient temp around 66°
Has to be that cold for res temps to stay under 72° Can’t run chiller with 5 DWC buckets, directly under light is probably not 66°surprised you got it to sprout in temps like that. They like it like 80°+ and Rh 60%+
Oh shit ok super paranoid about root slime/rot, read maintaining promoter res temps prevent bothI'd get a leaf surface temp and see what it is. I'd worry less about water temp and more about proper growing environment. If your methodical about making sure no light gets in the rez change rez frequently and keep your hands out of it you should be ok. I don't even pay attention to rez Temps honestly