[jhildebrand]

I cut a 75 down and my frag tank looks pretty much the same as yours. I had the same idea of a small daily water change with the waste water going to the frag tank to flush that system with display water. I love the idea of less equipment and being able to QT and medicate that tank. The pumps are friggin expensive though. Right now I'm manually changing 4 gal a day from my sump to the frag tank. Randy Holmes-Farley uses the Reef Filler pump to auto change a daily amount that would work perfectly for this application. I'll be tagging along for this one as I try to tweak my own similar setup...