2-Stone Pond Aerator to oxygenate your pond, helping create a more stable environment, resulting in healthier plants and fish.  Every process that happens in the pond is dependent on oxygen. This is especially important at night when plants are not converting fish-created CO2 into oxygen. Dissolved oxygen levels are also generally lower in warmer water temperatures. Pond aerators oxygenate your pond, helping create a more stable environment, resulting in healthier fish and plants.