I bought a 180 out of impose and decided not to set it up but still had the itch for a tank. One looking at the sump and refugium and a light bulb came on. So the refugium became the display tank, the dimension is 20lx16w16h and the sump is 36lx16wx16h. I run 4x 65w pc but might change to 250w mh. The skimmer is an ASM G1X and biweekly I do a 5g water change.