Hello, since it's gotten hot here, I can only keep my res and canopy temps below 68/80 respectively, by blowing intake air directly into the 20 gallon res. This is from a 4" 150 cfm fan (nowhere near that much going in) which keeps the h2o at 68 but I am wondering how much roots (these are two weeks old) can handle. 2 days with this configuration and the slight brown root-rot looking taproots haven't worsened and have grown a little. It's a dwc with LOADS of sprayers. Every cubic mm is wet. You can also feel the cool air current coming up through the 4" pots and can smell the nutes. Is active, if not direct, air a root killer? Thanks. DC