So I was interested in making one of those little self sustaining ecosystems, I was curious if I could use a cherry shrimp and a 1" marimo ball, together would they be enough, to sustain each other or should I also include another plant in there? Also I was reading that I could use either my establish fish tanks water, or get some water from a pond. Which would be better? If I use my fish tank water should I take the water off the top or get some dirtiness from the gravel as well? I was thinking of using a large wine bottle as the container.