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Exploring the World of Pygmy Corydoras

In the vast and diverse realm of aquarium fish, the Pygmy Corydoras (Corydoras pygmaeus) stand out as fascinating, diminutive treasures that have captured the hearts of aquarists around the world. With their petite size, delightful behavior, and ease of care, these small catfish species have become a beloved addition to many home aquariums. In this article, we will delve into the intriguing world of Pygmy Corydoras and discover why they are such a popular choice among fish enthusiasts.

Origins and Natural Habitat

Pygmy Corydoras, also known as Pygmy Catfish or Pygmy Cory Cats, are native to the South American continent, specifically found in the upper Rio Madeira basin in Brazil. In their natural habitat, these tiny catfish thrive in clear, slow-moving waters with sandy or gravelly substrates, often dotted with submerged vegetation and driftwood.

Their small size and bottom-dwelling nature allow them to navigate the intricate network of waterways, feeding primarily on small invertebrates, algae, and detritus found on the substrate. Their subtle coloration and peaceful disposition are well-suited for blending into their environment, making them a fascinating subject for observation in the aquarium.

Appearance and Behavior

One of the key attractions of Pygmy Corydoras is their charming appearance. These miniature catfish typically reach a size of around 1 inch (2.5 centimeters) when fully grown. They are characterized by their slender bodies, delicate translucent fins, and a distinct dark line running horizontally along their sides, creating a striking contrast with their pale body color.

Pygmy Corydoras are well-known for their sociable and communal behavior. They are naturally schooling fish, and keeping them in groups of six or more is highly recommended. When housed together in a suitable aquarium, they form tight-knit schools that gracefully glide along the substrate, creating a captivating spectacle for aquarium enthusiasts.

Their playful nature and constant activity level add vibrancy to any aquarium. Pygmy Corydoras are a joy to watch as they sift through the substrate in search of food and interact with each other in their peaceful community.

Aquarium Requirements

Successfully caring for Pygmy Corydoras in your aquarium involves providing an environment that mimics their natural habitat. Here are some key considerations:

  1. Tank Size: Given their small size, a tank with a capacity of 10 to 20 gallons (approximately 38 to 76 liters) is generally suitable for a group of Pygmy Corydoras. A longer tank with ample horizontal swimming space is preferable over a tall tank.

  2. Water Parameters: Pygmy Corydoras thrive in water conditions that are slightly acidic to neutral with a pH range of 6.0 to 7.5. The water temperature should be maintained between 72°F to 78°F (22°C to 26°C).

  3. Substrate: Provide a fine-gravel or sand substrate to mimic their natural habitat. A soft substrate is essential to protect their sensitive barbels, which they use to locate food in the substrate.

  4. Filtration: A gentle filter with adjustable flow is recommended to ensure water quality while minimizing strong currents that might stress these fish. Adequate filtration is crucial to maintain water clarity and remove waste.

  5. Tankmates: Pygmy Corydoras are peaceful and compatible with other non-aggressive fish species, such as small tetras, rasboras, and dwarf cichlids. Avoid housing them with larger, more aggressive species that may outcompete or intimidate them.


Pygmy Corydoras are omnivorous, and their diet in the aquarium should include a variety of foods. They readily accept high-quality sinking pellets, flakes, and frozen or live foods such as brine shrimp, bloodworms, and daphnia. Providing a diverse diet ensures their nutritional needs are met and promotes their overall health and vitality.

Breeding Pygmy Corydoras

Breeding Pygmy Corydoras in captivity is achievable with the right conditions and patience. To encourage spawning, provide a separate breeding tank with gentle water movement and a slightly cooler temperature drop (around 70°F or 21°C). The female will lay eggs on smooth surfaces, such as leaves or glass. Once the eggs are laid, the adults should be removed to prevent them from consuming the eggs. After a few days, the fry will hatch and can be fed infusoria and later, baby brine shrimp.


Pygmy Corydoras may be small in size, but they pack a big punch when it comes to adding charm and vivacity to your aquarium. Their delightful behavior, subtle beauty, and ease of care make them an excellent choice for aquarists of all experience levels. Whether you're a seasoned hobbyist looking to enhance your collection or a newcomer eager to explore the world of aquarium keeping, Pygmy Corydoras are sure to capture your heart and become the tiny treasures of your aquatic kingdom.

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