How do I keep my fish tank cool during a heatwave?
Cut back on feeding. If your aquarium is close to a window or in direct sunlight, keep the curtains/blinds closed. Switch off your aquarium lights, as some types can generate a lot of heat. Increase aeration, because the warmer the water, the lower the oxygen levels.
Can a fan cool down a fish tank?
A fan mounted at an angle or completely horizontal blowing on the water surface can decrease the temperature of the aquarium significantly. Keep in mind that if a lot of water evaporates from the aquarium, the salinity of the water will increase.
How can I cool my fish tank without a chiller?
Some equipment, like certain high-output lights, often have fans incorporated into their fixtures. You can use a desk or window fan to cool the aquarium. Just run the fan over the water. Always use the lowest setting to avoid blowing water out of the aquarium.