Trying to determine how much ATO volume I might need in order to alot space in my new stand. My current tank running a chiller evaps almost nothing but it has an enclosed canopy. My new system will have about 125 gallons total volume and 93 in the DT. I have a nice little 3 gallon Rubbermaid trashcan that would fit nicely with little footprint but I fear it may not be enough for top-off.