One of the best working sumps/refugium that have ever seen incorporated both meathods. My LFS has a 210gallon reef tank that is absolutley beautiful. They have a bunch of Hang on refugiums to display their products as well as a great custom acrylic sump. They have an elevated compartment full of bio balls were the overflow system flows right over everything. from there they have a nice baffle system into a large lighted section (60 gallon or so, this is where they get their live sand to sell to others) with a 6in live sand bed with live rock and micro algea. from here they a have another nice baffle system that feeds into the return section wich houses a huge protien skimmer and their return pump. Everything is plumbed through the wall so the mess of tubs and equipment is in one of the store rooms. Very impressive if I say so my self.
