Aquarium chillers are important to maintain a constant temperature in aquariums where fish and coral sensitive to temperature variations are living or being grown. Lights, pumps, and the surrounding room air heat up water in your tank. Hailea chillers are important for growing coral and are used in marine aquariums, where fish need a relatively constant temperature, allowing a stable level of oxygen in the water. Cold water temperatures in your aquarium are essential to mimic the natural habitat of deep sea fish. Water chillers can also used in hydroponic gardening to maintain water temperatures for optimal plant growing conditions.