Nanus Corydoras 3.5cm

Nanus Corydoras

The corydoras nanus is an adorable species that is quite underrated but part of that is a result of their rarity in Australia along with their higher price compared to other Corydoras. These fish however remain small, have truly striking colours, and are a great alternative to the more recognized dwarf corydoras species. This particular species only reach around 5 cm which makes them perfect for smaller aquarium and they are surprisingly easy to care for. Given the right environmental conditions they will also breed in the home aquarium and make for a great breeding project but they can also just be enjoyed in a community setting.

Corydoras nanus is practically compressed corydoras, their features are a lot more toned down and they have this adorable, stubby took to them. This fish can be easily recognized by their rounded snout, round body, and primarily the contrasting black and white colour they sport. Nanus corydoras have a white body colour with an abundance of black striping and spots which travels from head to tail, they are also present on the dorsal fin. In some cases, the fins can show a yellow tinge but this may only come out in more mature individuals. The cheeks of the nanus corydoras also have a light jade green sheen which seems to be a common factor amongst nearly all corydoras.

Just like any other corydoras species the corydoras nanus constantly stir the substrate layer to look for food. Whilst most can easily keep a deep substrate layer churned up, the nanus cory may have some difficulty because of their small size. They are almost exclusively bottom-dwelling fish and are an awesome option to add some life to the bottom of the tank. The corydoras nanus is not a shy fish either and are constantly active, making them a great and popular fish for the community and planted aquariums. These fish are also considered to be schooling catfish, in the wild they are often seen in groups of a few hundred however in the home aquarium it is recommended to keep at least 3 or more. An ideal school would be around 6 plus individuals to make them feel comfortable and to add some activity to the tank. 

Due to their inherent rarity in the aquarium hobby, there is a lack of exact breeding information however the process should be fairly easy as every other corydoras species has essentially been bred in captivity.  Differentiating males and females are possible where the males are often smaller and narrower compared to the larger-bodied females. The best method to identify is to get a pack of 4-6 nanus corydoras and let a pair naturally form. Females are often triggered to spawn after being fed high-quality food and a slight reduction in the temperature. The wild origin of the corydoras nanus is South America.

Tank Recommendations for your Corydoras Nanus 

As nanus corydoras reach around 5 cm as adults it is best to keep them in an aquarium with a minimum size of around 50 liters. A larger aquarium will always be better due to their active behavior and it also allows for the space to keep other tank mates. 

A sand substrate is best as coarser substrates like gravel often result in corydoras damaging their barbels. The corydoras nanus would look great against both a light and dark substrate since they will contrast amazingly well in either situation.  They will also love plants in the aquarium and places for cover through the addition of driftwood. 

Suitable Tank Buddies

Bethanae nanus is an incredibly peaceful fish that can be kept in a massive range of community aquariums. They do not display any aggression even when breeding and make for a perfect addition even with sensitive or shy fish. The only factor which should be considered is that Corydoras are almost exclusively a bottom-dwelling species which means that any super active or large top-dwelling fish may outcompete the corydoras for food.  

Usually Compatible

community fish such as rams, tetras, angelfish, discus, rainbow fish, and many more.

Sometimes Compatible

Larger peaceful South American cichlids such as Uaru, Severums, and other fish may outcompete them as they are mostly bottom-dwelling and small fish. 

Rarely Compatible

Large and aggressive species such as the Oscars may prey on the Corydoras. This is especially important as Corydoras have spines on their pectoral fins like many catfish, this can result in both the corydoras and the predator fish’s death.

Feeding your Nanus Corydoras 

Just like any other corydoras these fish are very easy to feed. They will take a wide range of pellets, flakes, and frozen foods. Just like any fish though they should be fed a varied diet with a mix of different foods. The ideal diet would be a good quality micro slow-sinking pellet or crushed flake, supplemented with frozen bloodworms or black worms or even live foods like baby brine shrimp or micro worms.