I don't know if the second floor would hold a 200g tank and we were planning on refinishing the basement so I went to work on planning our new "Family Room" to include our fish family members.
The basement room is about 14X28 and we mostly used it for junk storage and piano. A year ago a pipe that led to the kitchen burst and I had to take down the valance on the right to get to the pipe to fix it.
I know many would have just fixed the valance but the 1970s paneling had to go.
My plan was to put the aquarium against the far wall where the piano sits. Behind the wall is a cantina in the garage. In the floor of the cantina is drain. Unfortunately there is about a 30" concrete foundation a third of the way up the wall. The rest is wood frame so I figure I could somehow drain over the foundation into the drain to make water changes easier.
On the right side of the wall is a shutoff that leads to the outside hose so that you can turn off the sprinkler without going outside. I figured I could tap into this line and run a line to the ro/di near the tank.
I had to use a pressure fitting as I had a tough time getting around the back to sweat the joint properly and I was afraid I would burn down the house if I got too aggressive with the torch. The line went perfect I just needed to get it to where the tank would be. I knew that the wall was going to be behind book cases and the tank so the easy thing to do was to cut the drywall, drill the studs, and run the line. All went well and I even patched the drywall good enough that the cuts aren't noticeable.