I've improvised with an electric blanket which is keeping the bottom of the tray nice and warm!

So that water shouldn't actually be touching the Rapid Rooter? It should be below it to work sort of as a boiler to keep the humidity up?

Thanks for the suggestion Rich but I'm proceeding with all 36, and when I go to do my mother I will need two more tents and more equipment. I'm just going to do one grow all the way through for quality. At this point I'd love to get SOG going but it's just not within my resources.