How I can put bubbles in my tank?

I have a 20 gallon aquarium with a whisper out of the filter tank. I would also like a bubble "filter." I have the tube, where I can find a good? And the bomb, but I tried this before, but I can not understand (yes, I'm your average American idiot (-:) a. So is how I believe it is necessary to: 1. Having everything ready (aerators connection pipe and tubing to the pump. 2. Place the air stone directly into the gravel. 3. Turn Whenever the pump to the air stone, I try to bury the pipe, but it just floats back of gravel resulting in a tube in the center of my tank. It seems terrible! So my question: Can you please send me a URL of a suitable air pump (not powerful, but just enough to make bubbles) which is cheap. And how I can bury it? Sorry for the extended details, but please help me if you can. Thanks a lot!

may require a suction cup for Toob it sticks on the side of the tank? or put any weight on the tube to remain in the water? this works a little like the filter, but only for bubbles is not to filter the water works well http://www.petco.com/Assets/product_images/3% 5C3017239128B.jpg

29G Freshwater Aquarium with Sand Fountain

Marineland PA0548F Flexible Bubble Wand with Anti-siphon Valve, 48-Inch $5.99 Marineland Flexible Bubble Wand The Marineland Flexible Bubble Wand helps create a beautiful parade of dancing, sparkling bubbles in your aquarium. This bubble wand provides air circulation, and offers healthy oxygen to your tank. Specially weighted, the wand can be bent to fit in any aquarium, needs no suction cups, and includes a free anti-siphon valve. Features: . Bend to fit any space, weighte…

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