I could be lookin' at it totally the wrong way. The change in the gph could be logarithmic, or the wave patterns could effect it. I'm trying to figure out if I could get away with a pair of MP40s (already thinking about the next tank
). I don't think I can twist the numbers in a way to convince myself that I could. In looking at the flow diagrams I prefer the 40.
Scape can have a huge impact on the flow, too.