Fish Tank Cooler: When the temperature of fish tank reaches 86℉, the life of fish will be threatened, DEGGOX Fish Tank Cooling Fan can keep the temperature of fish tank at 68℉-78℉. Suitable Aquarium:Suggest for 20-60 gallon rimless aquariums less than 0.6 inches thick, product length 8.4 inches Adjustable Speeds and Timer :With 5 adjustable air speeds and 5 timer settings (0.5H/1H/2H/4H/12H), this aquarium cooling fan allows you to customize your cooling to ensure the best conditions for your fish. Power & Sound：The maximum power of the high-power fan is 7.5W, and the sound of the fan varies according to the speed gear, so those who are more concerned about the sound should be cautious in purchasing! Service：DEGGOX aquarium fan is made of high quality material, free replacement within one year. When summer comes, the temperature of the fish tank will rise with the natural temperature, when the temperature of the tank reaches 86℉, the life of the fish will be threatened, DEGGOX Fish Tank Cooling Fan can keep the temperature of fish tank at 68℉-78℉.