I am making a 55 gallon sump for my 75 gallon reef. The tank is 3'x1' and about 16 inches tall. My overflow is going directly down to the bottom of my first chamber where water will come up through bio balls and over the top of the first wall, the second chamber will be live rock, sand, heater, and a filter pump off of my old 20 gallon. Water will go over the top of this wall to my third chamber where the protein skimmer will be. From there it will go through a bubble trap to the final chamber where my return pump will be. Anyone want to throw out some sizes of chambers? I need to know how much space the skimmer and return pump will typically take up. I have the dividers made already. Thanks in advance.