Air stones via tubing and an air pump produce fine tiny air bubbles in an aquarium, a fish tank or a pond. This will help increase the water circulation, also break the surface tension of the water, thereby aiding the oxygenation of the fish tanks water by means of the oxygen/carbon dioxide (O2/CO2) gas exchanges i.e. carbon dioxide leaves the water and oxygen is absorbed into the water (H2O) by the means of agitation. This is known as "gas exchange" or as you may know it as oxygenating the water.
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