check these out:

Aquarium Air Pumps: Hydor Ario Turbo Air Pump

i use the ario 4 w/out a light. cheap, quiet, reliable. they put out tons of air, and help keep water circulating and nutrients suspended in the water. i have yet to find anything better.
TheHappyCamper Reviewed by TheHappyCamper on . I??ve got proper bubbles for once. Finally got a real bubble making machine. It is soooo nice and quiet compared to most of the other littler ones I have. I don??t know how much difference it makes, but it comes with a plastic tray designed to reduce vibration and noise. Haven??t tried it without the tray yet. Check it out. Bubbles galore. Now that??s how 2 6? air stones and 4 small air stones ought to look when they are supplied with air from 1/3 of an air pumps nozzles. You can barely see the 6? stone in 4? deep Rating: 5