PharmaCan, what a nice piece of work! Well done. Can I hire you to do some stuff around here? Unfortunately, I think you'd hate the 12,000 mile commute. :D
A good subterfuge for the neighbours is to call it a 'photo darkroom.' Explains ventilation fans to some degree. I
DO like the network ops T1 1024Mbps hub gobbledygook, tho. :D You can just see the eyes glassing over.
I see you have your cooltubes in series. Just wondering, what is the temp of the air when it enters the 2nd tube? Considered ducting them in 'parallel'?
You might find some use in
this tutorial on cloning in rockwool.