I run my fans 24x7. I am using 2x3 = 6 fans for my 3 ft planted tank. I noticed before I installed the fans, Water Temp was about 29 - 30 Degrees. After the fans are turned ON, Water Temp went down to about 26 - 27 degrees (with Lights ON). Since the ambient temp in the morning/night is cooler, the Water Temp registers about 25.3 degrees early in the morning/late at night.
This is the 2nd round I am installing the fans. The 1st round of 2x3 fans ran 24x7 and "run until fail" before I got the replacements. I am using the normal 12v computer fans (all 6 of them), solder-wired them together and power is via an external DC PSU. A cheaper cooling alternative...Each fan costs about S$4 (from Sim Lim SQ). So far, no problems... Only problem is the water evaporates quite fast and I need to top up about 3-5 litres at least once a week.
I am even thinking of installing another 4 more fans, so that makes a total of TEN cooling fans !!! Woah...!
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