I am new to the whole aquarium world, but am very interested and wanting to learn. I am getting a 29 gallon tank soon and I have a question about air pumps and air stones. I know about cycling tanks and all that so no need to worry. I realize that with a tank that size aeration would be necessary. My question is, how exactly do you set it up? Obviously, the tube runs from the pump to the tank and the stone on the end of the tube. But where do you put it all? Do you run the tube down a corner and put the stone under the gravel? Put the stone on top of the gravel? What exactly does the stone do? Does the stone release oxygen? Any help would be greatly appreciated!