One of the things I have come up with is this, and I don't know if its contrary to all the experts opinions or not, but here goes anyway.
In the display tank an inordinate amount of flow is needed to keep deitrius in suspension -- that much everyone pretty much agrees on and repeats endlessly
However, it makes sense to me if the flow through the sump is not high in comparison, This is where we want all the deitrius that was kept suspended in the main display to end up settling out or being skimmed out.
There should be a blurb that says that in concise language somewhere...
