REED!*read*
It is always best to water in the morning, and keep them on a strict regimen of just feeding them at a certain time. Depending on how cold ur night temps. are then u could run the risk of mould..possible.
Im not too sure bout this myself, theoretically speakings (dont think thats spell correctly)
Trying to build a box made from particle board not plywood, sealing that box with some silicone then mounting a blower fan with rubber gromets (feeting) to a cut 2x4 plank so that the plank fits inside...