There are a lot of variables that can impact the health of a reef tank and temperature is something that should be watched carefully during the warm summer months. A chiller is the best way to keep things cool but they are high ticket items. Budget conscious reef keepers do have options such as using a fan across the top of the tank to promote evaporation, which cools the water. This is exactly what I did when I first entered the hobby fresh out of college with minimal coin. The fans certainly worked but I needed more punch and pondered other cheap alternatives. I came up with what I thought was a bright idea at the time…..find an old water cooler and turn it into a MORE