Peppered cory
Corydoras paleatus
The quintessential Corydoras of temperate fishkeeping: robust, long-lived and among the first fish bred in captivity in hobby history. The silver body peppered with black and dark green is classic and recognizable. A crucial detail often overlooked: it is not a tropical fish. It prefers cool temperatures (16–24 °C) and suffers from prolonged heat — 30 °C is the danger threshold. Sharp pectoral and dorsal spines for defense: handle with care when netting. Among the easiest Corydoras to breed, stimulated by cool water changes simulating the rainy season.
Water Temperature
20 - 24 °C
pH Value
6 - 8
Water type
Freshwater
Tank level
Bottom
Adult size
6 cm
Minimum tank volume
>= 60 L
Minimum group
>= 6
GH
2 - 15 dGH
KH
1 - 7 dKH
TDS
40 - 295 ppm
Conductivity
63 - 461 uS/cm
Species description
Geographical Origin and Habitat: South America (from the Paraná basin in Brazil to the La Plata basin in Uruguay and Argentina). It is a subtropical fish that lives in stagnant pools, marginal lakes and slow rivers.
Taxonomy and Morphology: Peppered Corydoras (Corydoras paleatus). One of the oldest corydoras in the aquarium hobby, second only to C. aeneus. Rounded snout profile and massive body, possesses the ability to breathe atmospheric air.
Social Behavior: Always peaceful. A schooling animal par excellence (at least 6, ideally more than 10), if kept alone it falls into severe stress and constantly isolates itself, wasting away in a short time.
Coloration and Sexual Dimorphism: Gray or bronze base color covered by irregular black or olive spots (hence "peppered"). Females become gigantic and massively thick compared to males. Albino variants are known on the market.
Care, breeding and tankmates
Aquarium Setup: Minimum 80 cm (32 inches) tank. Mandatory obligation of the sand bottom (no sharp substrates). Floating plants or broad leaves on the bottom to offer shaded areas.
Diet and Feeding: Tireless omnivorous scavenger, but does NOT eat waste. Needs formulated pellets for catfish, combined with quality frozen food such as bloodworms, tubifex (which it loves digging in the sand for) and daphnia.
Water Quality: INCREDIBLY robust fish. However, being a southern species, it prefers waters between 20° and 24°C (68-75°F), poorly tolerating the 28-30°C (82-86°F) of classic Amazonian tanks in summer.
Compatibility and Cohabitation: Perfect candidate for any community tank. Magnificent with "cold" fish such as large South American Characins (Buenos Aires Tetras), Danios or Corydoras nattereri. Avoid with large predatory Cichlids.
Aquarium Breeding: Very easy. The drop in atmospheric pressure (a thunderstorm outside the house) and a large change with very cold water trigger frantic T-chases and the laying of countless eggs on the tank glass.
Risks and Diseases: Sharp gravel wears away the barbels leading to starvation and certain death from fungal infections (Fungus). Intolerant to prolonged heat spikes.
Geographic Origin and Distribution
South America (from the Paraná basin in Brazil to the La Plata basin in Uruguay and Argentina). It is a subtropical fish that lives in stagnant pools, marginal lakes and slow rivers.
Origin
Tropical oceans and reefsExtra-Amazon South America
Fish profile
- Temperament
- Peaceful
- These catfish are incredibly docile, peaceful, and non-aggressive, making Corydoras paleatus perfect community tank residents. They are somewhat shy by nature and heavily rely on the presence of a school to feel secure and display their natural behaviors. Providing plenty of hiding spots such as caves, driftwood, and dense vegetation will make them feel more comfortable. They never bother other fish and often completely ignore species occupying the middle and upper levels of the tank.
- Diet
- Omnivore
- Corydoras paleatus is an omnivorous bottom feeder that constantly scavenges for food in the substrate. Their diet should be primarily composed of high-quality sinking pellets or wafers specifically formulated for bottom dwellers. To ensure optimal health and coloration, supplement their dry food with live or frozen foods such as bloodworms, daphnia, and brine shrimp. They will also eat uneaten food that falls from the surface, though they should not be treated merely as a clean-up crew.
- Life expectancy
- 5-10 years
- 5-10 years.
- Adult size
- 6 cm
- The catalog's scalar value is 6 cm. The FishBase SPECIES table (v25.04 snapshot) source reports a maximum adult measurement of 7.1 cm for this species, recorded as standard length (SL). The taxonomic record consulted is Corydoras paleatus (v25.04); female record. These figures are not interchangeable: the first is the profile's editorial reference, whereas the second is a published maximum under a specific measurement convention; differences among sources can reflect sex, population, life stage and measuring method.
- Sex ratio
- Specific M:F ratio
- While sexing them can be challenging, a ratio of two or three males per female is generally recommended for breeding Corydoras paleatus. Females are noticeably rounder and broader, especially when viewed from above, and tend to grow slightly larger. Males appear more slender and streamlined in comparison. Keeping them in a mixed-sex school naturally accommodates these ratios without requiring precise selection by the aquarist.
- Feeding frequency
- Once daily
- These active scavengers should be fed one to two times daily to ensure they receive adequate nutrition. It is important to offer Corydoras paleatus only as much food as they can consume within a few minutes to prevent water quality issues. Since they are somewhat nocturnal by nature, feeding them once right before the aquarium lights turn off can be very beneficial. Monitoring their feeding is essential, especially in community tanks where faster mid-water fish might outcompete them for food.
- Bioload
- Low to Medium
- Corydoras paleatus has a relatively small bioload compared to larger aquarium fish. Due to their compact size, they produce a manageable amount of waste that standard filtration can easily process. However, because they must be kept in groups of at least six, the cumulative bioload should be considered when stocking. Regular water changes and good mechanical filtration are still necessary to keep the substrate clean where they dwell.
- Flow
- Moderate
- In the wild, Corydoras paleatus typically inhabits slow to moderately flowing streams and tributaries. They appreciate some gentle water movement in the aquarium, which helps keep the water well-oxygenated. However, excessive current or strong powerheads should be avoided as it can exhaust them over time. A standard sponge filter or a hang-on-back filter with baffled flow usually provides the ideal water dynamics for this species.
- Jump risk
- No
- Reproduction
- Oviparous
- Breeding Corydoras paleatus in captivity is achievable but requires specific conditions to trigger spawning. A common trigger involves performing a large, slightly cooler water change to simulate the onset of the rainy season in their natural habitat. Females will lay adhesive eggs on broad-leaved plants, aquarium glass, or other flat surfaces. Once spawning is complete, the adult fish should be removed or the eggs transferred, as they may exhibit egg-eating behavior.
- Compatibility & tankmates
- Community
- This species is highly peaceful and makes an excellent addition to community aquariums. Corydoras paleatus gets along perfectly with small tetras, rasboras, dwarf cichlids, and peaceful livebearers. It is crucial to avoid housing them with large, aggressive, or predatory fish that could bully them or attempt to eat them. As a schooling fish, they find safety and comfort in numbers of their own kind or similar Corydoras species.
- Tank level
- Bottom
- As classic bottom dwellers, Corydoras paleatus occupies the lowest levels of the aquarium. They spend their days tirelessly exploring the substrate in search of morsels of food using their sensitive barbels. It is absolutely essential to provide a soft, sandy substrate to prevent damage to their delicate sensory barbels. Although they mostly remain at the bottom, they will occasionally dart to the water surface to swallow a bubble of air for intestinal respiration.
Scientific Parameters & Models
FishBase
Window to the official scientific data of the species
Data synced on: 06/15/2026
- Trophic level
- 2.9 ± 0.34 se
- Resilience
- Medium (1.4 - 4.4 years)
- Phylogenetic uniqueness (PD50)
- 0.5
- Bayesian Length-Weight
- a = 0.01995, b = 2.96
- VulnerabilityLow vulnerability (10 / 100)
Image gallery
Licensed images linked to the species or, when marked, to the closest representative taxon.
Related species
Recommendations grouped by close relatives, companion choices, and similar care.
