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A good rule of thumb to follow is that a pump should have a flow rate of 5 GPH (gallons per hour) for every gallon of water in the aquarium. For example, if you have a 29-gallon aquarium you will need a pump with a flow rate of at least 145 GPH to effectively turn over the tank. Whether you have a simple freshwater or a large marine aquarium, you need a fish tank pump. These aquarium pumps serve two purposes. First, they ensure that your tank maintains an adequate concentration of oxygen. Second, air pumps help to circulate the water forcing water through the filter allowing a cleaner fish tank. 

Water movement is best described as the circulatory system for your aquarium that helps maintain water quality and influence fish health. Proper water movement is important for promoting gas exchange, supplementing filtration, and providing physical and mental activity for aquarium inhabitants.