To turn a fish tank into a miniature home is easily done.
Take the glass out, turn the fish tank upside down and put a floor in. For the floor you can use a piece of cardboard or dollhouse flooring depend on how stable you want it to be.
You can get the very cute fish tank here, here
The Fishcondo, designed by Teddy Luong, a student at Carleton University School of Industrial Design, won first place at Umbra’s “Build a Better” design competition.