Smaller tanks overheating in summer?

[canadawest]

Speaking of high temperatures and fans....

Temperatures were not a problem with only my VHO lighting as I rarely saw more than 2 degrees difference between morning and evening temps. Now that I have the 250W MH running a few hours a day, my tank temp has jumped 2+ degrees while it's on. I definitely need a hood fan now.

I want a competant but QUIET fan that I can run on the same timer as the MH lamp. I have heard that DC fans are the quietest, but does anyone else have any suggestions?

If DC fans are the way to go, I suppose I could use a regular computer power supply or case fan and a radio shack AC/DC adapter? Is this correct?

PS... Darren, I recall you had a circular cutting bit for a drill for making large holes? If you still do, could I borrow it sometime?