I got this self contained ecosystem recently. The algae provides oxygen which sustains the shrimp which produce co2 which sustains the algae. It’s a little more complicated than that but I won’t bore you here

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Little tip: As someone who has over a hundred dwarf shrimp (cherry, blue dream, orange, and other neos) I notice that the shrimps here are looking a bit milky and seem to need a source of calcium, or possibly other missing nutrients that algae alone can't provide, if they are getting such nutrients then they might need a different lighting arrangement. 🦐