Good mention of running a full canopy to cut down water loss, but don't forget the sump too. Unlike the display tank, if you aren't lighting the sump you can significantly close up the top of it. Totally sealing it may not be practical, but it's something to shoot for.
I've also changed my theory on water flow rates. Rather than trying to push huge volumes through my sump to get good tank turnover, I've gone with a much smaller return pump on my sump (Mag9 at 90w to a QuietOne 2200 at 40w).
Oh, and eductors. Big increase in flow, with the same pump.
I'm going to be swapping my older Koralia 3's soon for the new Evolution 1050's. Again, more flow, less power. I'm told that the new design is possible to run on the wavemaker timer on my RKL, so that's a further bonus.
-Hans