Thanks for the advice guys.

The cpu fan on the res sounds interesting. Is the fan basically just blowing air into the res? If that's the case then wouldn't the air stones be taking care of piping cool air in? Or am I not looking at it the right way here? Perhaps the fan would do a better job, as I'm sure multiple airstones has been tried.

Hmmmm.....another idea could possibly be to install small air duct tubing instead of the cpu fan and pipe that to a small intake fan that draws air from outside the cab. Although the cpu fan would certainly be cheaper. I just can't wait to get up to testing some ideas I have!