I never bothered to learn what kind of aquarium it was that they were using when I first saw this PC mod over a year ago, but now that I have begun the hobby myself, the different aquariums out there could really make a difference with the pioneering of case modding that exists for PCs.
It makes me wonder how cool it would be to see a biOrb mod done with a PC.
I can't remember the complete details, but it was also discovered shortly after a couple different setups of the Mineral Oil PC Aquariums, that could also have water in them and run fine. Of course, if a tropical fish aquarium needs a heater, why not an 80 degree running PC? ;)