Ehrhardt's Corydoras

Adults of this species grow up to 4–5 cm in length. Their body is characterized by a more slender and elongated shape, which distinguishes them from most of their Corydoras relatives, who usually appear more stocky. The main body color is grayish-yellow, with characteristic dark, large markings. The fins and tail have a translucent structure.

The species is endemic to South America, inhabiting coastal rivers in the states of Santa Catarina and Paraná in Brazil, particularly in the Iguazu River basin. In nature, it prefers slow-flowing bodies of water with abundant vegetation and soft substrate, where it leads a benthic lifestyle.

A peaceful and social fish, active both day and night. For comfortable existence, a school of 5–6 or more individuals is necessary, as solitary keeping leads to stress and timidity. It coexists well with other non-aggressive fish species that occupy the middle and upper water layers.

This fish is undemanding and easy to keep, not requiring specific conditions. It is only important to provide it with clean, warm water, preferably with a soft substrate, and access to several shelters. Maintaining a stable habitat is achieved through regular aquarium maintenance, including partial water changes and waste removal, as well as the use of necessary equipment. Feeding. The choice of appropriate foods is of great importance. Given the benthic lifestyle of Corydoras ehrhardti, despite its omnivorous nature, it is recommended to use sinking dry or frozen foods. Live foods will also be an excellent addition to the diet. Behavior and compatibility. This is a peaceful and calm fish, preferring to stay in a group of 4–6 conspecifics. Thanks to its adaptability to a wide range of hydrochemical parameters, Corydoras ehrhardti can successfully coexist with many other freshwater fish. It gets along with almost any species, as long as they do not perceive it as potential prey.

An omnivorous species, it feeds on small invertebrates, insect larvae, and plant detritus in nature. In the aquarium, it accepts any high-quality food for bottom-dwelling fish: sinking pellets, tablets, and flakes. It is recommended to periodically include live or frozen foods, such as bloodworms, Artemia, or tubifex, in the diet to maintain health and activity.

Breeding occurs through spawning, where the female lays eggs on a substrate, such as broad plant leaves or the aquarium walls. Water changes and a slight decrease in temperature stimulate spawning. The parents do not care for their offspring. Fry are fed infusoria, and as they grow, they are transitioned to Artemia nauplii and finely crushed dry foods.

The fish has good immunity but is sensitive to water quality and substrate cleanliness. When kept in unsuitable conditions, especially with high organic levels or injury to the barbels by sharp substrate, it is susceptible to bacterial infections. An important condition for prevention is the use of soft sand and regular siphoning of the bottom.

When purchasing, choose active fish with clean skin free of spots, ulcers, or film. It is important to pay attention to the condition of the barbels: they should be intact, without signs of erosion or damage. Avoid individuals with sunken bellies or signs of apathy, as this may indicate emaciation or hidden diseases.