Two-striped Aphyosemion

Adults grow up to 4–5 cm. Males are distinguished by more colorful markings and larger fins—dorsal, anal, and caudal. These fins are adorned with red hues, turquoise edges, and a pattern of fine speckles. Two dark stripes run along the males' bodies, extending from the head to the tail. There is a special variety called 'Lagos Red,' characterized by a predominance of rich red color. Females, on the other hand, are much more modest: their fins are short and translucent, and their bodies have a gray-silver hue. Like males, females also have a two-striped pattern on their bodies.

The natural habitat of these fish spans equatorial Africa. They are widely found in the swampy coastal areas of Benin, Togo, and Nigeria, as well as in the lower reaches of the Niger River. Aphyosemions inhabit shallow streams, backwaters, and ponds formed among the forest litter in humid tropics. The depth of such bodies of water usually ranges from 1 to 30 cm, and they are often temporary formations that can completely dry up. The bottom in such places is thickly covered with fallen leaves, branches, and other organic matter.

Killifish are usually kept in species-specific aquariums. Nevertheless, cohabitation with other peaceful, tiny species is permissible. Male Two-striped Aphyosemions exhibit territorial behavior and may compete with each other. For small aquariums, it is advisable to acquire a group with one male and several females.

In their natural environment, Two-striped Aphyosemions live in conditions that many other fish species would find extreme. Such high adaptability significantly simplifies the care of these fish. They can be kept in small aquariums, from 20 to 40 liters. The water temperature should not exceed 24°C. Although the fish prefer soft, acidic water, they tolerate higher dGH values quite well. It is important to provide the aquarium with a lid or not fill it completely to prevent the fish from jumping out, as in nature, they use jumps to move from drying ponds to new ones. For decoration, it is recommended to use an abundance of floating and rooted plants, and to create a layer of fallen leaves on the bottom. More details on choosing suitable leaves for an aquarium can be found in a separate article. Lighting should be subdued. Any substrate will do, but for breeding, it is better to use specialized fibrous materials or thickets of fine-leaved mosses.

The diet of these fish should primarily consist of live or frozen foods, such as bloodworms, daphnia, artemia, as well as mosquito larvae and Drosophila fruit flies. If desired, they can be accustomed to dry foods, but it is important that such foods are rich in protein.

If the fish live in a community tank, it is advisable to set aside a separate tank for breeding. Optimal conditions are achieved in soft (up to 6 dGH) and slightly acidic (around 6.5 pH) water at a temperature of 22–24°C. It is important to feed the breeding pair high-protein foods or exclusively live foods. Eggs are laid in dense moss or a special spawning substrate. Egg development takes 12 to 14 days. The hatched fry should also be transferred to a separate container with identical water parameters. During the first 2–3 weeks, active filtration should be avoided to prevent the young from being sucked into the filter. Partial water changes with fresh water are performed once a week, and uneaten food residues must be promptly removed to avoid excessive pollution.

Favorable keeping conditions significantly reduce the risk of diseases. The use of live food can pose a threat, as it often carries parasites, but the immune system of healthy fish successfully copes with them. Detailed information on symptoms and treatment methods can be found in the 'Diseases of Aquarium Fish' section.

When choosing a Two-striped Aphyosemion, preference should be given to individuals with clean fins, free from signs of damage, film, or spots. A healthy fish should be active, display natural coloration, and show interest in its surroundings. Avoid specimens with clamped fins, uncharacteristic behavior (lethargy or chaotic movements), or signs of emaciation.

• Inspect the fish for the absence of parasites and sores on its body.
• Ensure that the male exhibits characteristic bright coloration, and the female does not appear emaciated.
• Ask the seller about the type of food the fish is accustomed to, as adaptation to dry mixes can be difficult. Quarantine after purchase is mandatory, as fish can be sensitive to changes in keeping conditions and pathogens carried by live food.