Flag Tail Oiapoque Cory-Tank Raised

The Flag Tail Oiapoque Cory, scientifically known as Corydoras oiapoquensis, is a small and striking species of Corydoras catfish native to the Oiapoque River basin in northern Brazil and French Guiana. It is valued in the aquarium hobby for its peaceful nature, active bottom-dwelling behavior, and distinctive fin markings that set it apart from other Corydoras.

Adult Flag Tail Oiapoque Corys typically reach about 2 to 2.5 inches (5 to 6.5 cm) in length. They have a compact, armored body with a silvery or pale gold base color. Their most distinctive feature is the “flag tail”—a bold black marking or band at the base of the tail fin, often paired with a white or pale band just before it, creating a flag-like appearance. The dorsal fin may display a faint dark spot, and the body is lightly patterned or subtly speckled. Males are generally slimmer and slightly more colorful than females.

A tank of at least 15 to 20 gallons is ideal for a small group. Flag Tail Oiapoque Corys are social fish and should always be kept in groups of six or more to reduce stress and promote natural shoaling and foraging behavior. The aquarium should have a soft sand or fine gravel substrate, as they love to sift and dig for food. Provide plenty of hiding spots with driftwood, rocks, and dense planting to mimic their natural habitat and provide security.

Water parameters for the Flag Tail Oiapoque Cory should include a temperature of 72 to 78°F (22 to 26°C), a pH between 6.0 and 7.5, and soft to moderately hard water. They are sensitive to poor water quality, so regular water changes and gentle, well-maintained filtration are essential.

Feeding Corydoras oiapoquensis is straightforward, as they are omnivorous and readily accept a variety of foods. Offer high-quality sinking pellets or wafers as a staple, and supplement with live or frozen foods such as bloodworms, daphnia, or brine shrimp. They will also scavenge for leftover food and help keep the substrate clean.

Flag Tail Oiapoque Corys are peaceful and do well in community tanks with other small, gentle species, such as tetras, rasboras, and other Corydoras. Avoid keeping them with large or aggressive fish that may outcompete or intimidate them.

Breeding the Flag Tail Oiapoque Cory is possible in captivity. They are typical egg scatterers, and spawning can be encouraged by performing regular water changes with slightly cooler water and providing a protein-rich diet. Use a separate breeding tank with fine-leaved plants or spawning mops for best results, and remove adults after eggs are laid to prevent predation.

Corydoras oiapoquensis (Flag Tail Oiapoque Cory) is a peaceful, attractive species that brings activity and interest to South American and community aquariums, especially those with soft substrates and plenty of cover.