I can do you one better.....We are putting our new 120 gallon where the 72 bowfront freshwater is. Then the 72 gallon freshwater is moving upstairs where the current 72 gallon reef tank is. We are not looking forward to this. We have to tear down disc tank, put them into rubbermaid tubs (works wonderfull) then put up 120 reef, make sure no leaks, etc . run for day or two (while fresh are still in tub :-/). Then when it is ok, start breaking down the reef tank and put corals/fish, etc. into rubbermaid tubs to carry downstairs to new tank. When that is done, we move fresh upstairs and put that tank up. Rubbermaid tubs are wonderful. We've used them many times and my corals, fish, inverts have lived a couple of weeks (carpet replaced, moved once, water leak on tank once , ect.) in them. I just put the heater in it and put the light across the top. We never lost anything. Just take your time. We do big water changes a couple of days before this and keep as much as that water as possible to transfer to new tank w/ the 125# of rock.