Does your aquarium run a little hot during the summer time, but not hot enough during the year to justify buying an expensive chiller? A good solution to keeping aquarium water temperatures in check is to use a fan to blow air across the water’s surface and various hot electrical devices. The air moving across the water induces evaporation, which cools down the water by as much as a few degrees. Air blowing past electrical equipment, such as the high intensity lighting found over our reef tanks, can remove warm air from a canopy and away from sensitive electrical components. This not only keeps the aquarium a little cooler, but it also prolongs the life of aquarium equipment.