Profile Photo

Maximum size : 5 cm

Duplicate Corydoras - Corydoras duplicareus : Complete Fish Profile & Care Guide

Table of contents


Duplicate Corydoras are not very common in the hobby; however, they make fantastic community aquarium fish due to their small size, peaceful nature, and hardiness. However, to create a beautiful display and let these sociable, shoaling fish feel more comfortable, they should be kept in groups of at least six, preferably more. Since Duplicate Corydoras can be sensitive to barbel infections, it is imperative that they are kept on a soft sand substrate rather than gravel, where waste can build up unseen. To keep these Corys healthy, regular maintenance should be carried out, including frequent partial water changes. Plant densely and provide shady retreats amongst bogwood. You can keep Duplicate Corydoras with most fish available in the hobby, including Dwarf Cichlids, Tetras, small to medium-sized Barbs, Gouramis and other peaceful Catfish. These Corys may prey on some more petite Dwarf Shrimp but are safe with larger shrimp and other ornamental invertebrates. However, it would be best if you refrained from keeping these fish with larger, more aggressive fish as they will feel intimidated and get outcompeted for food. Duplicate Corydoras have light tan heads and bodies with gold-coloured speckling around the lateral line. The top half of the body, from the base of the dorsal fin to the caudal fin, is dark black in colour, which can vary in depth on different individuals. The Duplicate Corydoras also has a dark-coloured mask from the top of the head that extends through the eyes towards the operculum. In addition, these Corys have a gold patch between the rear of the eye mask and the base of the dorsal fin. The variation of colour and markings, however, has a degree of overlap, so these cannot be wholly relied upon.

Duplicate Corydoras Photos

Sexual Dimorphism

It is somewhat straightforward to differentiate between the male and female Duplicate Corydoras. Adult males will be slimmer and a little shorter than females. In contrast, the females grow larger and are noticeably rounder and broader than males, especially when carrying eggs.

Quick Facts

Scientific NameCorydoras duplicareus
Year Described1995
Other NamesFalse Adolfoi Catfish
Max Size5 cm
Aquarium LevelBottom
Best kept asGroups 6+
Lifespan5 - 8 years

Water Parameters

Water TypeFreshwater
PH4.0 - 7.0
GH5 - 12
TDS18 - 90
68 - 79
20 - 26

Natural habitat

Duplicate Corydoras are endemic to a small portion of the upper Rio Negro system in Brazil, South America. These Corys inhabit pristine blackwaters that flow rapidly and are stained dark by organic chemicals in tributaries and flooded forests that run over a sandy substrate.

How to breed the Duplicate Corydoras

It can be relatively challenging to breed Duplicate Corydoras; having a separate tank with two or more males per female would be best. When the females are noticeably full of eggs, you should perform a significant 50 to 70 per cent water change with cooler water and increase the oxygenation and flow in the tank. It would help if you then repeated this daily until the fish spawn. These Corys will deposit their eggs on the tank glass, amongst fine-leaved plants or within submerged spawning mops. Once spawning is complete, you should remove either the adults or the eggs. If you decide to move the eggs, the raising tank will need the same water parameters as the spawning tank and be similarly well-oxygenated. Some breeders will add a few drops of methylene blue or place alder cones into the raising tank to stop the eggs from developing fungus. The incubation period is usually 2 to 4 days, and once the fry has consumed their yolk sacs, you can provide them with small live foods like microworm and baby brine shrimp. Corydoras fry can be quite challenging to raise, requiring excellent water quality. Still, they seem less susceptible to diseases when maintained over a thin layer of sand instead of a bare tank.

Diet & feeding

The Duplicate Corydoras will readily accept most good quality dried foods such as granules, flakes and sinking pellets. These modern food products have been developed to provide all adequate nutrition to maintain your fish's health and dietary requirements. Additional foodstuffs such as live, frozen, and freeze-dried meals such as bloodworm, daphnia, and tubifex once or twice a week will provide other benefits to your fish's health and well-being but is not a must for this fish. It should be noted that bloodworms should only be given as an occasional treat and should not be used as the staple diet as they are difficult for fish to digest and can potentially cause blockages. This fish is an omnivore in the wild, consuming some vegetable matter. Although most modern fish foods consider this and include them in their products, you can still supplement your fish's diet with blanched vegetables such as spinach, broccoli, and zucchini. Ensure you do not overfeed your fish and remove any leftovers the following day.

Other Corydoras you maybe interested in