When I go driving or walking sometimes, I see living rooms with koi aquariums. I'd love to keep koi inside, but their bioload is a frightening hurdle. What would prompt someone to wrestle like that? I can't imagine the maintenance on these tanks I've seen. Can a koi live its full lifespan in a tank like this? Is it even worth considering? I'd think not, but having seen it done, and the fish seeming content, the idea is tempting. Does anyone have a large koi in an indoor aquarium of 200g or less? Not just for the winter, but permanently? How old can these indoor fish really get before succumbing to either poor water quality or malnutrition, or both? Granted, they should reach three feet, but two feet is pretty good for being in an aquarium...or should I say bad?