Ecosystem 5/15

When an ecosystem is self sustaining, it requires it to be able to have a stable environment that isn't interfered with by an outside source. This self sustaining ecosystem has its own plants and animals that keep the environment running smoothly. This does not describe our aquarium's ecosystem because our aquarium relies on us to survive. We give the fish its food, and we provide the filter that keeps the water fresh and habitable. To become independent, it would require a natural filtration system and a means of food like smaller creatures that live in the water and provide food for the larger animals.