A self-sustaining ecosystem is one that does not need humans to take care of it for it to support life, it can take care of itself. Our aquarium ecosystem is not self-sustaining because it requires a filter, and we have to check the ammonia and nitrate levels and do water changes so the fish are not harmed. To become independent, our aquarium would need more sunlight and plants so it could keep up oxygen levels and keep the nitrate levels down.
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