Yea, for some reason though, I thought I read not to water at night.. Maybe I am wrong.. I am going to leave my 9:30 one run, and see if anyone has ebb&Flow and lets the water go.I dont run ebb & flow but I have dwc and my roots are in the water during lights off and have no problems. I dont think it would be a problem. They need to feed night or day it should be there for them. I could be wrong though