I have two 6" clip-on fans from Canadian Tire running over my sump, and if they are not on, my tank temperature rises very quickly. The two 4.5" fans in my hood don't seem to affect water temperature at all, but I think they are useful just for moving evaporating water out of the canopy and so on.
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-Quinn
Man, n. ...His chief occupation is extermination of other animals and his own species, which, however, multiplies with such insistent rapidity as to infest the whole habitable earth, and Canada. - A. Bierce, Devil's Dictionary, 1906
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