Mathieu Lehanneur (who, by the way, is an amazing designer), designed a system called “Local River,” inspired by the Locavore movement that would feed and entertain.
“This DIY fish-farm-cum-kitchen-garden is based on the principle of aquaponics coupled with the exchange and interdependence of two living organisms – plants and fish. The plants extract nutrients from the nitrate-rich dejecta of the fish. In doing so they act as a natural filter that purifies the water and maintains a vital balance for the eco-system in which the fish live.“
There has been another take on this type of fish tank called “Floating Garden“… the main selling point being a clean tank.