I'll have to concur with Rick on this one. Maybe a better question would be equating LPH of air your skimmer draws, to the volume of your system.

This way, you have a quantifiable measure. Now, I can tell you that my skimmer pulled 1150LPH of air and I had about 100G of water. Zoa's HATED my tank, but SPS growth was off the charts...

When I crashed my tank, and the SPS were disintegrating, the Zoas and Paly's I had, EXPLODED in growth. My Gobstoppers went from 15-20 polyps, to like 60 in 2 weeks.