Be very carfeful about your bubble/second starting point. Make sure you have enough time to watch the tank and make adjustments. Tom Wood said that 1 bubble/second is good for 40 gal. I have a 55 gal. If I run 25 bubbles/minute my fish will be dead. I run around 19 bubbles per minute and that is all I need. I'm not knocking Tom's advice for a starting point, but just make sure you monitor closely for the first day.