I am thinking about put together a 10 gallons aquarium WITHOUT using air or water pump (I don't like the idea of using machine to create a natural environment). The tank will full of plants and perhaps with one or two bettas (1 male, 1 female). if at all possible, I would like a create a natural environment where I only need to feed the fish daily and change the water once in a week. Is it possible to create a totally natural environment without using pumps? ??? Is there another way to keep the water clean and oxidized?