How Many Bronze Corys in a 55 Gallon Tank?
About 11–13 — based on adult size, bioload, and real water volume.
About 11–13 bronze cory
Photo via Wikimedia Commons
In a 55-gallon tank you can comfortably keep about 11–13 bronze cory — enough for a proper school, on their own with good filtration and regular water changes. Add fewer if you're mixing in other species.
How we get that number
An adult bronze cory reaches about 2.8" and has a moderate bioload. Working from real water volume and waste output (not the old one-inch-per-gallon myth), a 55-gallon tank supports roughly 11–13 of them. Because bronze cory are schooling fish, keep them in a group of at least 6 — never just one or two. They need 72–79°F water at pH 6–8.
Build your exact stocking with the calculator → Full bronze cory care guide →
Gear for a 55-gallon tank
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FAQ
How many bronze cory can I keep in a 55 gallon tank?
About 11–13 bronze cory, kept on their own with good filtration. Add fewer when combining with other species — use the stocking calculator to be sure.