At first I was thinking about making my own tank. Because My house has this little indent right where the stairs are which is 3.5ft long and 2ft wide and i can make it however tall i want, i was thinking 5 ft.tall and it would be around 260gallons. it would be a good place because it's right in the hallway. BUt you would need about 2.5in acrylic for it too hold all that water. But now im thinking of just buying around 100gallon tank