In my biocube 14g I have 700gph via a K1 and MJ1200. It even keeps spectrum pellets floating! I also turkey bast the heck out of the rocks constantly and have 3 sponges to catch detritus that gets into the rear chambers. It's a new experiment, but I am confident we under estimate the need for good LR husbandry.

The way I see it:
Lots of strategic flow ensures no dead spots during feeding, pooping and keeps sand clean between thorough syphonings at WC's
Regularly clean your mechanical filtration and perform weekly WC's
That leaves only your rocks to trap and release phosphates and nitrates. And if we are religious about keeping the rock pores clean it's a double win because the anaerobic bacteria has more locations to populate and eat phosphates and nitrates.