The main return is an AM3k, split into 2 1" retuns about 12" below entry to the tank. One of the closed loops is driven by an AM3k, split to 4 3/4" sea swirls. The 2nd closed loop is driven by a Little giant4, split into 3 3/4 returns behind the live rock. The skimmer is a SK1200 from Barr Aquatic, driven by an Iwaki 55. My refuge is a 75 gallon, a Mag 9.5 provides the flow. Sorry, no pics cuz it looks pretty ratty back there, nowhere near as clean as some people like to make it look.