I CUSTOM BUILT THIS SUMP...FROM A 30 GALLON. HAS THREE CHAMBERS, ONE FOR BIOBALLS/LIVEROCK, SECOND IS FOR A FUGE, AND THIRD IS THE RETURN. ALL SECTIONS ARE PRETTY MUCH THE SAME SIZE.. ABOUT 12" EACH. 15 LBS OF REFUGIUM MUD, HUGE MATS OF CHAETO(AS WELL AS THE TONS OF PODS IN THEM), 60 WATT 6700K...