Ecosystem Four, with a diverse set of organisms, is the most likely to be sustainable.
Ecosystem One: Elodea plants, Goldfish, Zebra fish, Rocks
Ecosystem Two: Elodea plants, Goldfish, Colorful gravel
Ecosystem Three: Elodea plants, Water lily plants, Lace ferns
Ecosystem Four: Elodea plants, Lace ferns, Goldfish, Snails
Of the listed ecosystems, Ecosystem Four with Elodea plants, Lace ferns, Goldfish, and Snails is most likely to be sustainable as it comprises a diverse set of organisms that can create a stable ecosystem with various interactions supporting each other.
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