SS, diffused aeration works the same whether it's in a pond or in a tank. As the bubbles rise to the surface through the water coulmn, they transfer the oxygen in the bubble to the water. When you hear people talk about moving water with bubbles they are usually talking about outdoor ponds or air lifts. The bubbles are still transfering oxygen, but its more the lifting action that you are after. In tanks, hauling or holding, diffused or "bubble" aeration is usually your best bet. Greg hit it right on the head that bubbles and agitators are the best 1-2 punch for hauling tank aeration and that the smaller the bubble, the more O2 you get.
