Using Aquarium Air Stones & Bubble Wands in Your Fish Tank

Ever since the early days of aquarium keeping, hobbyists have been using air pumps and air stones to introduce oxygen into the water. It may seem that the oxygen would enter via the multitude of air bubbles, but actually most of the oxygen enters at the surface of the aquarium water and the air stones help by bringing up a column of water with the bubbles and turning it over from the bottom to the top of the water. The air stones also help prevent stagnant areas from developing where the water may become oxygen deficient.