Information, Freshwater fish, Species

Blue Corydoras: Complete Species & Care Overview

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by Jason Matthews


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The Blue Corydoras, also known as the Blue Cory, is a freshwater fish species native to South America. These fish are known for their striking blue coloration and peaceful nature, making them popular among pet fish owners.

Whether you’re a beginner or an intermediate fish keeper, the Blue Cory is an excellent addition to any freshwater aquarium. Not only are they beautiful to look at, but they are also hardy and easy to care for.

This article will delve into the specifics of the Blue Corydoras, including their origin, appearance, size, genders, behavior, tank conditions, tankmates, diet, breeding, and potential diseases. So, read on if you’re considering getting a Blue Corydoras or want to learn more about this fascinating species!


Scientific Name: Corydoras nattereri
Common Names: Blue corydoras, Blue Cory
Life Expectancy: Up to 10 years
Adult Size: 3 inches


HabitatSouth America, Rio Meta Basin
OriginColombia and Venezuela
Care LevelEasy
DietOmnivorous, eat both live and frozen food
Tank LevelBottom
Minimum Tank Size20 gal (75L)
Water pH6.0-7.5
Water Temperature72-82°F (22-28°C)
Water Hardness2-15 dGH
Tank MatesCommunity, non-aggressive species

Fun Fact Corner

It’s interesting to learn that Blue Corydoras are known for exhibiting an odd behavior known as “synchronized spawning.” When several of these fish mates simultaneously, the synchronous spawning is known as a spawning event. Due to the rarity of this behavior in other fish species, it is fascinating to observe. It’s a great example of how sociable and helpful these fish are.


It is found in Colombia and Venezuela’s upper Orinoco and Negro basins. These fish live in slow-moving rivers, tributaries, and swamps, usually in regions with a lot of leaf debris.

Blue Corydoras are a type of catfish, and they are closely related to other species of Corydoras found throughout South America. They are members of the family Callichthyidae, which includes over 150 different fish species. The genus Corydoras, to which the Blue Corydoras belongs, is the largest genus within the family, with over 160 different species.

The Blue Corydoras are a peaceful and hardy species, making them popular among pet fish owners. They are known for their striking blue coloration, ranging from a pale blue to a deep navy. These fish grow to a maximum size of about 3 inches, making them relatively small. Their lifespan is also fairly long, ranging from 5 to 7 years.

Appearance & Size

The Blue Corydoras is a striking fish species that stands out thanks to its vibrant blue coloring. The fish’s color can range from light blue to deep navy, with a silver-white belly. The fish has an extended body and armored plating on its sides. They use their four barbels—two on each of their upper and lower jaws—to dig for food in the substrate.

The Blue Corydoras is a species of fish that only attains a maximum length of 3 inches. They are sexually dimorphic, so males and females differ physically in them. Male fish typically have more elongated dorsal fins and a more pointed ventral fin, whereas female fish are typically rounder and have more rounded ventral fins.

The Blue Corydoras is distinguished by its distinctive eyes, striking coloration, and body shape. They have upward-facing eyes to help them survive in the murky waters of their habitat. They can now recognize movement and prey above them as a result.


The Blue Corydoras is a sexually dimorphic species with distinct physical differences between males and females. It can be difficult to tell blue corydoras apart based on gender, but with practice, it becomes easier.

While females tend to be rounder and have a more rounded ventral fin, males are typically slimmer and have more elongated dorsal fins and a more pointed ventral fin. The breeding tubercle on the male’s head, which is used to hold the eggs during breeding, is also more noticeable.

It is important to remember that these differences are not always obvious and that it can be challenging to determine the gender of young or subadult fish.


Blue Corydoras are a wonderful addition to a community tank because of their calm disposition and lack of aggression. They thrive in groups of at least six people because they are a species that schools. They are lively fish that can be seen swimming around the tank, frequently in the middle of the water. They are also bottom-dwellers, and you can see them scouring the substrate for food.

Blue Corydoras are known to be shy fish and often retreat to hiding spots when they feel threatened. It’s essential to provide plenty of hiding spots in the tank, such as caves, rocks, and plants, to help them feel secure.

These fish are also known to be very social and will often form tight-knit schools. They have often observed swimming and interacting with other members of their group. They can be kept with other peaceful species like tetras, rasboras, and livebearers because they are known for being calm and non-aggressive toward other fish.


Because they are a calm and non-aggressive fish species, the Blue Corydoras make good tankmates for various other fish species. When choosing tankmates for Blue Corydoras, it’s crucial to choose species that are calm and non-aggressive, have similar water needs, and are.

Good tankmates for Blue Corydoras include:

While Blue Corydoras are calm and non-aggressive, it’s important to remember that larger fish species that might view them as food do not make good tankmates for them. It’s also advised against keeping them with aggressive or territorial fish because they might bully or hurt them.

As a result of their calm nature and lack of aggression, blue corydoras make good tankmates for various other fish species.

Since they are a schooling species and perform better in a group, it is best to keep them in a group of at least 6. It’s important to select species that are peaceful and non-aggressive, have similar water requirements, and are when choosing tankmates.

Tank conditions

To ensure their welfare, the proper tank conditions must be provided when setting up an aquarium for Blue Corydoras. These fish are native to the slow-moving waters of South America and prefer a similar environment in captivity.

It’s recommended to have at least a 20-gallon tank with a sandy substrate and plenty of hiding spots such as caves, rocks, and plants. A filtered aquarium and a moderate water flow are also essential to their care.

The ideal pH range should be between 6.0 and 7.5, and the water temperature should be maintained between 72 and 78°F. They are also sensitive to the quality of the water, so it’s important to perform routine water changes and maintain stable water parameters.

Blue corydoras are also light-sensitive; they do best in low to moderate light but struggle in high light. Low lighting should be present in the tank; this can be accomplished by adding plants or by using a low-wattage light.


In captivity, the Blue Corydoras is an opportunistic feeder who will consume a wide range of foods. They are known to eat a variety of small invertebrates in their natural habitat, including insects, crustaceans, and worms. They can be fed various commercial fish foods in captivity, including flakes, pellets, and freeze-dried food.

To ensure their best health, you should give them a well-balanced diet consisting of various food types. Live or frozen bloodworms, brine shrimp, or daphnia can be served as a treat. A diet high in vegetables, such as peas or blanched spinach, is also beneficial to them.

Giving them small amounts of food two to three times a day is generally recommended. Overfeeding should be avoided because it could harm your health and water quality.


The Blue Corydoras species can be fairly easily bred in captivity under the right circumstances. To encourage breeding, it’s essential to provide them with the ideal tank conditions, which include a clean aquarium, a balanced diet, and a group of at least 6 individuals composed of a mixture of males and females.


Blue corydoras, like all fish, are susceptible to various diseases if they are not given the proper care. The most widespread ailments that can affect this species are as follows:

  • Ich
  • Fin Rot
  • Swim bladder
  • Columnaris

To prevent disease, it’s essential to maintain good water quality and provide a balanced diet. It’s also important to quarantine new fish before adding them to your tank and to observe your fish regularly for any signs of illness.


Jason Matthews

My name is Jason Matthews, and welcome to my website. When other kids were bragging about how their dog could sit and roll over, I was bragging about my latest Betta Fish and the cool sea castle I just added to his aquarium. 

Jason aquariume

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