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School Size to Tank Size Ratio Advice


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Assuming your picture is your planned final setup (no plants, no lid, lower water level I assume to prevent jumping), probably 8. But if I were setting up a 20 long for silver tip tetras it'd be filled to the top, have a lid, be stocked with plants, and with that setup I'd probably plan on adding 12-15. 

Also, for reference: 


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