Silver Dollar Tetra

Adults of this fish can reach a length of approximately 8 cm. Their body is characterized by a high profile and noticeable lateral compression, which, combined with their silvery coloration, earned them the name “silver dollar.” A distinctive feature is a bright black spot at the base of the tail; another, less pronounced, is located behind the gill cover. The anal and pelvic fins often have a reddish tint. Differences between males and females are subtle, making sex determination difficult.

The species inhabits South America, primarily the lower Orinoco River basin in Guyana, Suriname, and French Guiana. In nature, the fish populate shallow areas of rivers, preferring places with dense aquatic vegetation. The water bodies are characterized by stable water parameters, close to neutral pH values of around 7.0.

These fish are active and have a peaceful disposition. They feel comfortable in a group of at least 6–8 individuals; when kept alone, they become excessively timid. Ideal tank mates include other non-aggressive species of comparable size, such as various tetras, small catfish, and cyprinids, including barbs, danios, and rasboras.

For a school of 6–8 individuals, the optimal aquarium volume starts from 150 liters. When setting up the tank, it is important to provide both open spaces for free swimming and sheltered areas created by dense plant thickets. Preference should be given to plant species with tough leaves, as the fish tend to damage softer parts. Natural elements such as driftwood and stones will be a good addition. An important aspect of long-term keeping is maintaining a stable hydrochemical balance of the water within acceptable pH and dH values, as well as regular aquarium maintenance, including substrate cleaning, equipment checks, and partial water changes. Silver Dollar Tetras are sensitive to strong currents, which are often created by filters. Therefore, when choosing a filtration system, it is recommended to opt for models that provide gentle water movement. This species is omnivorous. They readily accept a variety of dry, frozen, and live foods of appropriate size. It is essential that plant components are included in their diet.

These fish are omnivorous and gladly accept various types of food, be it dry granules, frozen, or live foods of appropriate size, and it is important that their diet includes plant components. They are active and peaceful, preferring to live in a group of 6–8 individuals, as they become excessively timid when kept alone. They coexist well with other non-aggressive fish of similar size, such as tetras, small catfish, and cyprinids — for example, barbs, danios, and rasboras. Under favorable aquarium conditions, spawning occurs regularly. When the breeding period arrives, males display courtship rituals, and spawning takes place in the upper water layers among dense plant thickets. Fertilized eggs are left without parental protection, and their survival depends solely on the surrounding plants; adults do not care for their offspring and may eat their own eggs. To save the fry, it is recommended to carefully transfer the eggs to a separate tank with the same water conditions. The incubation period lasts from 30 to 36 hours. In the first days, the fry feed on the remnants of the yolk sac, and after about a week, they begin to swim freely in search of food, which should be offered in the form of specialized powdered foods or suspensions. Provided the living conditions are met and there are no aggressive tank inhabitants, the health risks for the fish are minimal. If the first signs of illness appear, it is important to check the hydrochemical composition of the water and ensure there are no dangerous concentrations of nitrogen cycle products. Often, stress and deterioration of the fish's condition are associated with poor water quality. Additional information on symptoms and treatment methods can be found in the “Aquarium Fish Diseases” section.

Under favorable aquarium conditions, these fish spawn regularly. During the breeding period, males display courtship rituals. Spawning usually occurs in the upper water layers, among dense plant thickets. Fertilized eggs are left without parental care; their only protection comes from the surrounding plants. Adult fish do not care for their offspring and may eat their own eggs. To save the fry, it is recommended to carefully transfer the eggs to a separate aquarium with identical water parameters. The incubation period lasts from 30 to 36 hours. In the first days after hatching, the fry feed on the remnants of the yolk sac, and after about a week, they begin to swim freely in search of food. They should be fed specialized powdered foods or suspensions.

Provided the correct habitat and absence of aggressive tank mates, the health of these fish usually remains robust. If the first signs of illness are observed, the first step should be to check the hydrochemical parameters of the water and the levels of nitrogen cycle products. It is possible that the cause of stress and poor well-being is low water quality. More detailed information on disease symptoms and treatment methods is available in the “Aquarium Fish Diseases” section.

When purchasing, choose active individuals with clean scales and no visible fin damage. Healthy fish should exhibit natural schooling behavior and show no signs of emaciation or body deformation. It is recommended to avoid specimens that appear excessively timid or constantly hide in a corner of the aquarium, as this may indicate stress or hidden diseases. It is important to ensure there are no spots, film, or ulcers on the fish's body.