Houston we have skimming!! The HOB overflow box came today. I was a little skeptical that it was going to work, but it is a really cool idea. We are overflowing over the rim of the tank, into the skimmer area of the sump, then through the baffles and into the chaeto chamber and out the return into the main tank. The whole thing is running wide open at approx. 350 gph. (we can actually add up to a 800gph return pump) and it looks to be pretty stable. Next up is a couple of switches, one for an ATO and the other to turn off the return pump before the sump runs dry.
Cheers! Mark
Cheers! Mark