Yeah I was suprised about the instant improvement I got when I moved the skimmer from the (very high water) skimmer compartment to the (much lower) refugium area.
I purchased the skimmer from somebody that got a complete Elos system and judging by the length of the silicone hose that connects to the pump and the screw holes on the bottom plate I am thinking the skimmer would have been mounted elevated in the Elos sump with the pump below (because the silicone hose is much too long to just go to a pump sitting next to it).