What Size Tank Does a Bronze Cory Need?
Adult standard length 3.0 inches. Keep a group of at least 4-6 on a 31 × 12 inch base, about 19 US gallons.
Full breakdown: how many fish per gallon. Full breakdown: how many fish in a 20 gallon tank.
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The figures
| Figure | Value | Source |
|---|---|---|
| Adult standard length | 3.0 in | Seriously Fish |
| Minimum aquarium base | 31 × 12 in | Seriously Fish |
| Approximate volume | 19 US gallons | Seriously Fish |
| Group / social | Group of at least 4-6 | Seriously Fish |
| Filter rating | 290-360 liters per hour | Seriously Fish |
| Filter rating in gallons per hour | 76.62-95.11 gph | Calculated from the published liters per hour ÷ 3.785 (Seriously Fish; 1 US gallon = 3.785 liters) |
| Temperature | 70-81°F | Seriously Fish |
| Heater on the profile | 50-75 watts, assuming a room around 68°F | Seriously Fish |
| Aqueon bands that contain about 19 gallons | 50 watts for 5-20 gallons, and 100 watts for 15-40 gallons | Aqueon |
Full breakdown: what size filter for a 20 gallon tank.
How to size it
The base is the shopping clue. Seriously Fish asks for 31 × 12 inches, about 19 US gallons, for a bottom group of at least 4-6. A 31 inch length is the case the 20 gallon long search is meant to find. About 19 US gallons is the volume to judge it by, not a guess that a taller tank of the same gallons would do. Adult standard length is 3.0 inches, which is the fish, not the tank.
Four times about 19 gallons is 76 gallons per hour, and five times is 95. The converted rating, 76.62-95.11 gph, matches that turnover almost gallon for gallon. The profile does not call the flow gentle. Bristlenose plecos share this 290-360 liter rating and this 31 × 12 inch base; they do not share the cory temperature or the 4-6 group count.
About 19 gallons is inside two Aqueon lines. Aqueon gives 50 watts to 5-20 gallons and 100 watts to 15-40 gallons. 19 is not above 20, and it is not below 15, so both bands include it. The 150 watt band starts at 30 and does not. The profile's heater is 50-75 watts for 70-81°F, assuming a room around 68°F. 75 watts sits between the 50 watt and 100 watt Aqueon ratings; it is not a third band on the Aqueon chart.
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Accessory: a 50 watt heater, the bottom of the profile's 50-75 watt span and one of the two Aqueon bands that contain about 19 gallons. Shop a 50 watt aquarium heater on Amazon
Related pages
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FAQ
What size tank does a bronze cory need?
Seriously Fish lists a minimum base of 31 × 12 inches, about 19 US gallons, for Corydoras aeneus, and a group of at least 4-6. Adult standard length is 3.0 inches.
What filter rating is listed for bronze corys?
Seriously Fish lists 290-360 liters per hour. Dividing by 3.785 gives 76.62-95.11 gallons per hour. Four times about 19 gallons is 76 gallons per hour, and five times is 95.
Which heater bands include about 19 gallons?
Aqueon lists 50 watts for 5-20 gallons and 100 watts for 15-40 gallons. About 19 gallons is inside both. Seriously Fish lists 70-81°F and a 50-75 watt heater, assuming a room around 68°F.
Sources
- Seriously Fish, Corydoras aeneus. https://www.seriouslyfish.com/species/corydoras-aeneus/. Accessed Oct 2, 2026.
- Aqueon, Heater Wattage Guidelines. https://www.aqueon.com/-/media/project/oneweb/aqueon/files/us/educational/aq_heater_wattage_chart.pdf. Accessed Oct 2, 2026.