i have a 5' 105gal tank in my basement, I have a 120mm fan on each end of my canopy, 1 blowing air in, 1 sucking air out. When I run the fans at full speed, my tank temp goes down, even with the halides on..so I turned them down to 9v instead of 12v. I'm not sure what the cfm is now, but full speed is around 86cfm.
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