Air pumps help to introduce air into the water of your aquarium. While they don't inject air into the water, they work by agitating the surface, which in turn pushes water in. They can work particularly well if used alongside a fish tank filter. They can also be used to power aquarium ornaments that need air bubbles to work. Some people like to add air stones to the tank to increase the amount of bubbles, this is mainly for decorative reasons, rather than functional.
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