Duplicate Cory Care Guide - Aquarium Setup, Diet & Breeding

Duplicate Cory is a small, beautifully marked armoured catfish with a pale cream to golden body, a dark mask through the eye and a bold black stripe running along the upper back. The contrast between its warm base colour and dark markings makes it especially appealing in a planted freshwater aquarium. It is closely related in appearance to Adolfos Cory, and the two are often compared by aquarists because of their similar patterning.

Like other Corydoras, this species is a peaceful bottom-dweller that spends much of its time exploring the substrate with sensitive barbels. It may rest among plants or hardscape, then suddenly become active as it searches for food or rises briefly to the surface to gulp air. Its armoured plates provide protection, while the sharp pectoral and dorsal spines can make it difficult for predators to swallow.

Duplicate Corys are social fish with lively, engaging group behaviour. In a suitable shoal they investigate their surroundings together, forage side by side and often settle in close contact beneath cover. They are not aggressive, but they are active enough to be entertaining without disturbing more timid tankmates.

In nature, this cory inhabits quiet or gently flowing Amazonian waters influenced by fallen leaves and decomposing vegetation. The resulting blackwater environment is often clear but heavily stained with tannins, and the soft sandy substrate allows the fish to forage without damaging its delicate barbels. The species remains comparatively uncommon in the hobby and is valued by aquarists who enjoy naturally patterned Corydoras.

Duplicate Cory is native to Brazil in South America, where it occurs in the Rio Demini system, a tributary of the upper Rio Negro in the Amazon Basin. It comes from soft, tannin-stained blackwater habitats with sandy bottoms, leaf litter and submerged vegetation.

A group of Duplicate Corys should be given at least 60 litres, with a footprint of approximately 60 x 30 cm or larger; a longer aquarium is preferable to a tall, narrow one. Use fine aquarium sand or another smooth, rounded substrate so the fish can root through it without damaging their barbels. Include driftwood, smooth stones, caves, broad-leaved plants and areas of leaf litter to provide shelter and recreate its complex blackwater habitat, while leaving open sandy areas for foraging. Gentle filtration, good oxygenation and subdued lighting are beneficial, particularly when floating plants or shaded areas are provided.

Up to about 5 cm (2 in) in total length. Females are typically larger and broader-bodied than males, while males usually remain closer to 4–4.5 cm (1.6–1.8 in).

Duplicate Cory is an omnivorous bottom-feeder that should receive a varied diet of high-quality sinking catfish pellets or wafers, supplemented with frozen or live foods such as bloodworm, daphnia, mosquito larvae and brine shrimp. Small portions of soft foods can be offered regularly, with food spread across the substrate so every fish in the group can feed. It should not be expected to survive on leftover food alone, and its barbels and digestive health benefit from a clean, varied diet.

Duplicate Cory is a peaceful community fish that can be kept with similarly gentle species such as small tetras, pencilfish, rasboras, peaceful South American dwarf cichlids, otocinclus and other calm Corydoras. Suitable tankmates should share its preference for warm, clean freshwater and should not compete aggressively for food. Avoid large predatory fish, fin-nippers, boisterous feeders and territorial bottom-dwellers that may injure or intimidate it.

Duplicate Corys are egg-scattering, open-water spawners that can be encouraged to breed when kept in a mature, well-maintained aquarium and given abundant live or frozen foods. A partial water change with slightly cooler, soft water often stimulates spawning. The pair or group deposits adhesive eggs on plant leaves, aquarium glass or other smooth surfaces, usually with several females spawning alongside males. Adults may eat the eggs, so remove the eggs or move the breeding group to a separate spawning aquarium. Incubation usually takes around three to five days, and the fry can be raised on infusoria-sized foods before progressing to newly hatched brine shrimp.

Females are generally larger, deeper-bodied and noticeably wider when viewed from above, especially when carrying eggs. Males are slimmer and slightly smaller, with a more streamlined profile; colouration is broadly similar in both sexes.