The fans in the hood have been replaced, with ones that are more powerful (though just as noisy):
The fans I chose are a bit thicker then the original fans. The screw holes line up perfectly, but the original screws are too short for the mounts towards the front of the hood.
The fans (in the third photo) are being run by Modular LED's fan power supply and adapter. They worked perfectly, and there was no indication of overheating. I let them run for 12 hours.
This is going to be a HUGE improvement over the original components, as the fans can be left running when the lights are off. What I consider a major design flaw with the Nano Cubes is that the fans shut off when the CF bulbs shut off. It is true that the fans will be underneath the splash guard (when I finally have the hood all put back together), and they don't do much for air exchange. But, with these closed systems, and the challenges in maintaining pH, I do feel the fans should run 24/7: no potential source of O2 should be left off.
The fans came from Memory Express. Unfortunatly, Modular LED doesn't offer a 60mm fan.