I'd say, a FW
tank, wrapping around in a huge circle around a room, 10 feet in diameter, 3 feet tall, 2 feet deep. It would be sparsely planted with sandy substrate in parts, and medium to heavily planted in other parts. It would have large schools of neon, rummy, and silver tip tetra. As well as large shoals of different species of corydoras, and otos. It would also have a common pleco, and half a dozen to a dozen Angelfish in it too. Is also add some khuli loaches, large schools of marble hatchetfish, and some rainbowfish too. As well as cherry red, or crystal red shrimp in the more heavily planted areas, like THICKLY planted areas.
This tank would also be constructed in plates, with curved corners and sealed, with acrylic construction. That way IF I ever had to move, I could tear her down and move her in pieces.