There are fish tanks that require no water changes. You immerse the rinsed off roots of the Chinese Evergreen house plant in the tank with the leaves above the water. You just top off the tank with Reverse Osmosis (RO
) water that has the minerals removed.
The plant roots remove all forms of nitrogen the fish produce through their waste and the water stays clean. You do have to use RO
water to top off the tank or minerals can build up to toxic levels. This build up takes many months, if not years before it becomes toxic to the fish.