Oxygen
There are 2 other ways I can think of that will maximize your oxygen levels.
1 - Growing macroalgae in a sump or refugium will help suck out CO2 and introduce O2 into your water.
2 - Create a small oxygen reactor. I would only recommend doing this if you have TONS of fish that are breathing really quickly, otherwise this method is generally obsolete now.
Keep in mind that there is probably lot's of oxygen generating areas in your tank already. Power heads do a great deal at the water surface, skimming, and even water tumbling down the overflow makes a difference.
Just my .02
Jeff
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