did you presoak the hydroton? no, i didn't know about presoaking hydroton, I just put it in the bottom of the pots. Does everyone soak it?

is the 70-75F at the canopy? yes, that is where I hang the thermometer, as well as the remote temperature sensor that talks to the AC

you have a fan pulling air into the tent? and an oscillating/regular fan? can you elaborate a little more on your cooling setup please. Yes there is a low-power fan blowing air into the tent, and then there is a high-power fan taking air off the light and there is an AC blowing cool air into the tent. All are always on.