Molly sphenops

Female Molly sphenops reach up to 12 cm in length and are generally noticeably larger than males, whose size does not exceed 8 cm; their rounded abdomen also contributes to this. Wild specimens have a modest gray-silver coloration, with iridescent turquoise specks visible on their scales. Selective varieties, however, impress with a diversity of colors, including white, yellow, red, and other shades, as well as patterns such as "dalmatian" or "marble." Differences are also observed in the shape of the dorsal and caudal fins, for example, in Lyretails.

The natural habitat of the Molly sphenops covers significant territories of South and Central America, extending from Venezuela and Colombia in the south to Mexico in the north. Isolated populations are also found on the Caribbean islands. Currently, this species has successfully colonized new territories and inhabits natural conditions in the USA, Southeast Asia, and southern regions of Europe. In nature, the fish prefer shallow, heavily vegetated bodies of water, including coastal zones where fresh and saltwater mix.

Molly sphenops are characterized by a peaceful nature and coexist well with other non-aggressive fish of comparable size. Males may exhibit excessive activity during courtship, and in the absence of sufficient hiding places in small aquariums, this can cause stress to females. For this reason, in small tanks, it is preferable to maintain a group according to the harem principle: one male and several females.

For a group consisting of 3–4 fish, an aquarium of optimal size should have a volume of 100–150 liters. It is recommended to use aquatic plants abundantly when decorating the aquarium; both rooted and floating species will provide reliable cover for females, subdominant males, and growing fry. Initially, for successful keeping of Molly sphenops, slightly alkaline water and high general hardness were necessary. However, as a result of long-term selective breeding, modern varieties have successfully adapted to various conditions, including soft water, so pH and GH parameters no longer play such a decisive role. It is much more critical to prevent water quality deterioration caused by the accumulation of organic waste, such as food remnants and excrement. The best protection against problems is regular weekly partial water changes with fresh water and the uninterrupted operation of the filtration system. Some populations of this species are often found in brackish waters in nature, which led to recommendations to add salt to the aquarium. This procedure is permissible but not mandatory, and beginners may encounter difficulties in correctly calculating the concentration.

Molly sphenops are an omnivorous species. In a home aquarium, they readily accept most common specialized foods. The optimal choice will be foods developed to meet the needs of Mollies, which are produced by many companies. Such foods often contain a significant amount of plant additives, which is an essential component of their daily diet. Without these additives, the fish can significantly damage delicate aquarium plants.

Breeding this species usually does not cause difficulties. Under favorable conditions, the fish regularly produce offspring. The incubation period is approximately 3–5 weeks, after which the female gives birth to fully formed fry. Since Mollies do not show parental care for their offspring, it is recommended to transfer the fry to a separate tank to prevent them from being eaten by adult specimens. Nevertheless, with a sufficient number of hiding places in the form of dense plant thickets, many fry are quite capable of growing to adulthood even in a community tank. It is important to remember that color variations of this species can successfully interbreed, producing mixed offspring.

Wild representatives of this species show significant resilience, but as a result of many years of selective breeding, many commercially available varieties and hybrids have become less robust and more susceptible to various diseases. This is especially true for the popular Black Molly. The only way to minimize the risk of disease outbreaks is to provide the fish with suitable living conditions. Low temperatures, frequent and sharp fluctuations in pH and GH values, as well as inadequate nutrition, negatively affect immunity, which can provoke the development of various diseases.

When purchasing, choose active and mobile fish with clean scales without visible damage, white spots, or film. Avoid specimens that stay near the water surface, frequently gulp air, or exhibit apathetic behavior, pressing their fins against their body. In the store, it is advisable to inspect the condition of the abdomen: it should not be excessively sunken, as this may indicate emaciation or the presence of internal parasites. Keep in mind that selective forms, especially entirely black varieties, may be more sensitive to transportation and adaptation conditions, so prefer fish from aquariums with good filtration and no signs of disease in tank mates.