Better oxygen exchange

[Pan]

Originally Posted by Jeff_

There are a couple things that could increase o2 concentration.
1. Skimmer- pretty much any skimmer will increase the o2 concentration. Look for the skimmer that has the highest air intake?
2. Air pump- This would probably cause a ton of salt creep, but will increase o2
3. As you said a larger sump means more area of gas exchange and any kind of surface agitation would also increase the o2 content.
4. Lastly, a refugium with 24 hr lighting. The photosynthesis would add o2 in the water.
HTH

24 hr refugium is not good, you need to let the plants recover from the light, 12 and 12 is better. 24hr you'll kill your macro algae's