[ejwsr]

Todd,
I knew I was missing something important. By routing your skimmer outflow through your refugium you are oxygenating the water. The algae needs CO2 for carbohydrate synthesis. Since high O2/low CO2 levels exist in your fuge, you are starving the algae since they cant make their own food any more. What I would is route water from your filter system (put a T in the return line with a small valve so that you can adjust your flow) through your fuge. There should be plenty of available CO2 for your algae.

Back to flow rates for a moment. I have a Current Nano Fission skimmer in my NanoCube. It has an 84gph pump. Due to how the air is introduced (through the pump suction) the water flow is cut way back. I would wager that my water flow through my skimmer is at or below 10 gph.