Well summer is coming and the tank stating to get warmer. I'm, thinking about using 120mm Computer Case Fans to cool the tank.. That brings me to my question. I have a 56 gallon column, and my friend has a 120 gallon tank as well as a 75 gallon tank. Anyone ever cooled there tank with PC fans? If so how many fans did it take to get the job done. I'e only ran test in a bucket to see if it would drop the temp and it did, I'm just wondering if anyone done it over a larger surface area.. Since it not warm to try it on the tanks, looming for advice.