I have never had a reef tank and I'm slowly working on building my first system. I have a 120 gallon tank that will be my DT and I'm working on planning my sump (which will be in my basement) hopefully using the materials that I have available to me. I understand that large volumes lead to greater stability so I would like to put that into play. I have a 160 gallon poly cistern tank and a 20 gallon aquarium. Would I be able to drain my DT into the cistern and then pump my return out of the base while using my 20 gallon aquarium with treatment equipment in a sidestream arrangement to and from the cistern using a separate pump?