![]() ![]() All of these places cultivate bacteria and aids in removing the ammonia and nitrites as the water flows through the cycle. The gravel, the grates beneath the gravel, the bottom of the aquarium, and the walls of the filter tubes. The biological filtration takes place in a few key locations. Using an air pump will add a little more oxygen to the water, whereas a powerhead will likely move the water faster increasing the number of gallons per hour that are passing through the gravel. This is how the cycle flows no matter what you use to move the water. ![]() ![]() For a 16×30 inch base you should be looking at a powerhead that will pump 200-300 gallons per hour. Your powerhead should be rated from 60-90 GPH per square foot. The powerhead you should be using depends on the square footage of your tanks base. Not a whole lot different from using an air pump. Powerhead (water pump)Water is pumped up and out of the filter tubes back into the aquarium and, by effect, drawing new water through the gravel to the bottom of the tank.Any air pumps that I have seen will tell you how many gallons they are rated for, be sure to buy an air pump that is rated for the volume of your aquarium. If you go this route, do the smart thing and make sure you put a check valve in the airline. Air PumpA fish tank air pump is used to push air through a line down to the bottom of the filter tubes, the air bubbles rise to the top of the tube pushing water out with the air bubbles and by effect water is drawn trough the gravel to the bottom of the tank.These filters can be powered by 2 methods, air pumps or power heads: ![]()
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