Moved into a new house and have to get another tank (cross brace on the 46 bow broke). I have a deal on a 72 gal bowfront drilled with overflow, a sump tank and a protein skimmer. Stupid question number one: does the pump on the octopus protein skimmer just push water thru the skimmer or does it also pump water back up to the display tank? Stupid question number 2: what do I need to put into the sump in the way of dividers or baffles to make it function as a freshwater sump? Thanks in advance for insight and advice!