I'm probably leaving for further studies soon. But I want to leave some junk in my parents to contend with. Thinking of creating a self-sufficient tank. Somewhere along the lines of a 5x1.5x3 feet tank. If biology class serves me right, I need to create a complete ecosystem in the tank. So anyone got any ideas as to what plants, what fish and how to go about it? No feeding, no filters and no water changes. Just occasional addition of water. I know it is possible because some duo from university managed to create one. A constant renewable food source is the first problem I wanna solve. Help!