12-06-2009, 10:39 AM
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It makes a lot of sense to ask questions before jumping to an answer, that way you can give the right advice.
Something I was curious about are the dimensions of your tank, and the type of filtration you are running. Canister filters running with the output pointed away from the surface may be less effective for providing extra oxygen exchange, as opposed to the output being pointed up, agitating the surface. Power filters do a great job with the waterfall to agitate the surface. Live plants are another excellent, and more effective, addition to an aquarium as they provide oxygen.
As stated, in most cases the filtration provides adequate aeration. One such situation; however, may be different. For example I have a tall hexagon tank that has a rather small water surface exposed to the air in proportion to the overall volume. That type of tank I would consider running an air pump and air stone or getting live plants. Also in warmer water tanks, that are overcrowded, oxygen levels may be low due to warmer water, and so many fish consuming it.