Pygmy corridoras (lat.Corydoras pygmaeus) or pygmy catfish is one of the smallest catfishes that amateurs keep in the aquarium.
Its size is about two centimeters, and like all corridors it is a schooling and peaceful bottom fish.
Living in nature
It lives in South America, in the rivers Amazon, Paraguay, Rio Madeira, flowing through Brazil, Argentina and Paraguay. It occurs in tributaries, streams and flooded forests. Most often you can find it among aquatic vegetation and tree roots, moving in large schools.
These corridors live in a subtropical climate, at a water temperature of 22-26 ° C, 6.0-8.0 pH and hardness of 5-19 dGH. They feed on insects and their larvae, plankton and algae.
The name itself suggests that it is a small fish. And true, its maximum length is 3.5 cm, and the females are larger than the males.
However, in the aquarium it rarely grows more than 3.2 cm. Usually, the length of males is 2 cm and females are 2.5 m.
His body is more elongated than that of other corridors.
Body color is silver gray, with a thin continuous horizontal line running along the body to the caudal fin. The second line goes from the ventral fins to the tail.
The upper body with a dark gray tint that starts from the muzzle and ends at the tail. The fry are born with vertical stripes that disappear by the first month of their life, and horizontal ones appear in their place.
For keeping a small flock, an aquarium with a volume of 40 liters or more is enough. In nature, they live in water with 6.0 - 8.0 pH, hardness of 5 - 19 dGH, and temperature (22 - 26 ° C).
It is desirable to adhere to the same indicators in the aquarium.
Somiki pygmies prefer dim, diffused lighting, a large number of aquatic plants, driftwood and other shelters.
Ideally they look in a biotope, an aquarium recreating the Amazon. Fine sand, driftwood, fallen leaves all this will create conditions as close as possible to real ones.
In this case, aquarium plants can not be used at all, or use a limited number of species.
And keep in mind that when using snags and leaves, the water will become tea-colored, but do not be afraid, since the pygmy corridors live in nature in just such water.
Due to their small size, they can live in small aquariums. For example, a volume of 40 liters is enough for a small flock, but they will not be very comfortable, as these are active fish. Unlike most corridors, pygmies swim with the middle layers of water.
Unpretentious, eat both live, frozen, and artificial feed. Their main feature is a small mouth, so feed should be selected accordingly.
To achieve the best color and maximum size, it is advisable to regularly give artemia and daphnia.
Corydoras pygmaeus is a schooling fish that spends most of its time swimming among plants. Unlike other corridors, they like to stay in the middle layers of water and spend more time there. When tired, go to rest on the leaves of plants.
They like to be in a stream of water, suddenly changing direction with a sharp swing of their pectoral fins. These fast movements combined with a high respiration rate give the fish a very “nervous” appearance compared to other fish.
In nature, pygmy corridors live in packs, so a minimum of 6-10 animals must be kept in the aquarium. Then they behave more confidently, keep the flock, and look more impressive.
Absolutely peaceful, catfish pygmies nevertheless are not suitable for every aquarium. Larger and more predatory fish can consider them as food, so be careful when choosing your neighbors.
Even scalars and gourami can attack them, not to mention other catfish. Good neighbors will be small haracin, cyprinids, and small shrimps.
Actually, neons, iris, rhodostomuses and other schooling fish.
As with all corridors, females are larger and noticeably wider, especially when viewed from above.
Breeds pygmy corridor simple enough, it is difficult to grow fry, as they are very small. The spawning stimulus is the substitution of water for colder water, after which spawning begins if the females are ready.
They lay eggs on the glass of the aquarium, after which the producers are removed, as they can eat caviar. Whitened and coated eggs should be removed before it spreads to others.
Fry is fed with small feeds, such as ciliates and egg yolk, gradually transferring to brine shrimp nauplii.