Aquarium water temperatures can climb pretty quickly during the day. The lights turn on, the air temperatures in the house can elevate, and water pumps can heat up the water. To combat these temperature spikes, hobbyists don’t have to run expensive chillers. Instead, there are several behavioral techniques we can use to keep the water temps down. For one, open up the doors on the stand. This will allow plenty of air circulation around the equipment below the tank and release trapped heat being emitted by external pumps. Hobbyists can also open up the doors on aquarium hoods or cut back on the length and intensity of the light fixtures. To drive down temperatures even further, a set of inexpensive fans can be aimed at the water’s surface to induce evaporation, which cools the air temperature around the aquarium.