Bronze Corydoras
Corydoras aeneus
The Bronze Corydoras is a charming and highly popular freshwater fish known for its peaceful nature and striking bronze coloration. It has a stout body with barbels around its mouth, allowing it to forage effectively on the substrate. Often seen in schools, this species is well-loved for its social behavior and bottom-dwelling habits.
The Bronze Corydoras features a robust, silvery-green body with bronze highlights and distinctive dark spots along its flanks.
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Quick Facts
Size
3 inches
Temperament
Peaceful
Difficulty
Beginner
Min Tank Size
20 gallons
Lifespan
5-10 years
Origin
South America
Diet
Omnivore - flakes, pellets, live foods
Water Parameters
22-26°C
6-8
5-19 dGH
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Calculate heater sizeCare Notes
- Bronze Corydoras thrive in a tank setup with a soft substrate like sand or smooth gravel, which prevents damage to their sensitive barbels while they forage.
- Maintain stable, well-oxygenated water; typical captive-care ranges are ~72-79°F (22-26°C), pH ~6.0-7.5 (tolerance can extend to ~8.0), and soft to moderately hard water (commonly cited up to ~12 dGH, with some references listing higher tolerance).
- Offer a varied diet including high-quality sinking pellets and occasional treats of live or frozen foods like bloodworms and daphnia to keep them healthy and active.
- This species is peaceful and social, best kept in groups of at least five to six individuals, and makes excellent tank mates for other non-aggressive community fish.
- Though not particularly challenging, breeding can be encouraged by slightly lowering the water temperature and increasing oxygenation, simulating rainy season conditions.
- Watch for common health issues like barbel erosion or fungal infections, typically caused by poor water quality or inappropriate substrate.
- Regular partial water changes and good filtration are essential to maintain high water quality and support the well-being of Bronze Corydoras.
Compatibility
Good Tankmates
- Other peaceful community fish (avoid fish that bully bottom dwellers; provide adequate group size and floor space)
- Small tetras and rasboras
- Dwarf shrimp species (with caution; may eat shrimplets)
- Non-aggressive bottom dwellers like kuhli loaches
- Snails such as nerite or mystery snails
- Peaceful gouramis like honey gouramis
Avoid
- Aggressive cichlids
- Large predatory fish
- Fin-nipping fish such as tiger barbs
- Large crayfish species
Habitat and Natural Environment
The Bronze Corydoras, scientifically known as Corydoras aeneus, is native to South America, where it can be found in freshwater rivers and streams with slow to moderate flow. These fish thrive in environments that have sandy substrates and are abundant in plant life, providing both cover and feeding opportunities.
Tank Setup Requirements
To mimic their natural habitat, it is essential to provide a soft, sandy substrate in the aquarium, which is gentle on the Corydoras' sensitive barbels. A planted aquarium with plenty of hiding spots is ideal. Live plants, driftwood, and rocks can help create a naturalistic setup.
- Tank Size: Minimum 20 gallons
- Water Temperature: 20-26°C (68-79°F)
- pH Level: 6.0-7.5
- Water Hardness: 2-12 dGH
Ensure adequate filtration and water movement to maintain high water quality and oxygenation, which are critical to the health of Bronze Corydoras.
Feeding and Diet
Bronze Corydoras are omnivorous and have a varied diet. In the aquarium, they should be fed sinking pellets or wafers, complemented by live or frozen foods such as bloodworms, brine shrimp, and daphnia.
- Sinking pellets
- Live or frozen food: bloodworms, brine shrimp, daphnia
- Occasional vegetable matter
Feed small amounts twice daily to prevent leftovers from degrading water quality.
Behavior and Temperament
Bronze Corydoras are peaceful, social fish that feel most comfortable in groups. Keeping them in a school of at least six individuals is recommended to ensure their well-being and a natural display of their social behaviors. They are bottom-dwellers, often seen scavenging the substrate for food.
Ideal tank mates include other small, peaceful fish species that thrive in similar water conditions.
Breeding
Breeding Bronze Corydoras is achievable in a home aquarium with the right conditions. They typically breed in large schools.
- Increase protein in diet leading up to breeding
- Simulate rainy season by lowering temperature slightly and performing frequent water changes
- Females will lay eggs on glass, plants, or other tank surfaces
Remove adults after spawning to prevent them from eating the eggs.
Health and Common Issues
Bronze Corydoras are generally hardy fish, but they are prone to certain health issues. Maintaining clean water conditions is essential to their health.
- Watch for signs of stress, such as clamped fins or unusual erratic swimming
- Prone to barbels injuries from rough substrates
- Susceptible to common freshwater diseases like Ich
Avoid copper-based medications, which can be harmful to corydoras and other scaleless fish.
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