![]() 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.
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