Aquarium Fan,Ultra-Quiet Fish Tank Cooler,More Powerful,Cooling Effect 3-7℉ with 3 Speed Modes Adjustable Applicable Aquariums with or Without Edges, for Axolotl Seawater Freshwater Coral Grass TankBrand: AQUASMITH Color: Black Features: Necessary Cooler for 24 7 operationAxolotls and other sensitive species are vulnerable to heat stress. The AQUASMITH aquarium fan offers efficient cooling via evaporative technology. Unlike ordinary fans, Its dual fan pressurized duct concentrates airflow onto the water surface, ensuring all wind force acts directly on the water surface,It can quickly lower aquarium water temperature by 3 7F to thereby creating