Hoplisoma duplicareum (Duplicareus cory)

Hoplisoma duplicareum (formerly Corydoras duplicareus), commonly known as the Duplicate Cory, is a small, peaceful, bottom-dwelling catfish native to the upper Rio Negro basin in Brazil. Prized by aquarists for its striking silver-to-gold body, black eye mask, and bold black dorsal stripe, it thrives in shoals within well-maintained freshwater tanks.

Key Species Facts

• Maximum Size: ~4 to 6.5 cm (1.5 to 2.5 inches)
• Temperature: 22°C to 26°C (72°F to 79°F)
• Water Parameters: Soft and slightly acidic. Optimal pH: 6.0 to 7.2, dH: up to 15 degrees

Care Requirements

Tank Size & Grouping

As a highly social species, they must be kept in groups of at least 6 to 8 individuals. A minimum aquarium volume of 60 to 80 liters is recommended.

Substrate

A soft, sandy substrate is essential. These fish use delicate barbels to sift through the bottom; rough gravel can damage these sensory organs, leading to infection.

Environment

Mimic their natural blackwater habitat by using botanicals, driftwood, and low-to-moderate lighting to provide shaded areas where they feel secure.

Diet

They are scavenging omnivores that require a varied diet. Feed them high-quality sinking pellets, wafers, and occasional treats of live or frozen foods (like bloodworms or brine shrimp) to keep them healthy.

Identification & Similar Species

It is very easy to confuse H. duplicareum with the closely related H. adolfoi. The Duplicate Cory can be distinguished by:

• A slightly deeper, higher body shape
• A much broader, thicker black band running along its back
• Serrated inner edges on its pectoral fin spines, whereas H. adolfoi has smooth ones

Notable Characteristics

Like many members of the Hoplisoma genus, the Duplicate Cory is capable of gulping atmospheric air. They can occasionally be seen swimming to the surface to breathe, which helps them survive in oxygen-poor waters in the wild.