The Moon Spot Licorice Gourami, scientifically known as Parosphromenus linkei, is a small, vividly patterned blackwater labyrinth fish native to the peat swamp forests of southern Borneo. It was historically confused with other species and at times mislabeled, but it is now correctly recognized as distinct from others like P. ornaticauda. This species gets its common name from the prominent round “moon-like” spot displayed on the caudal fin of males.Adult Parosphromenus linkei reach a maximum size of about 1 to 1.2 inches (2.5 to 3 cm). Males are striking, with a dark base body color that shimmers with iridescent green or turquoise lines along the flanks and fins. The defining feature is a bold, circular white or pale blue spot located centrally on the tail fin. Females are plainer in comparison, with more subdued coloration and shorter fins.In the aquarium, P. linkei thrives in a soft, acidic blackwater environment with low lighting and plenty of cover. A tank of at least 5 to 10 gallons is suitable for a pair or small group. The setup should include leaf litter, driftwood, botanicals, and floating plants to provide cover and mimic their natural habitat. Gentle filtration is essential, as these fish are sensitive to current and water quality fluctuations.Water parameters should closely resemble their wild habitat: temperatures between 74 and 82°F (23 to 28°C), a pH between 3.5 and 5.5, and extremely soft water with minimal hardness. These conditions are critical to their health and necessary to encourage natural behavior and breeding.Feeding can be selective—Parosphromenus linkei usually refuses dry food and should be given a diet of small live or frozen foods such as baby brine shrimp, daphnia, mosquito larvae, or grindal worms. Regular feeding with high-quality live food helps maintain color, activity, and reproductive readiness.Breeding is possible in captivity and follows typical licorice gourami behavior. Males claim a small cave or crevice and display to attract females. After spawning, the male guards the eggs, which hatch in about 24–36 hours. Fry become free-swimming after a few days and require infusoria or other microscopic foods before graduating to microworms and brine shrimp nauplii.Overall, Parosphromenus linkei (Moon Spot Licorice Gourami) is a visually stunning, peaceful, and fascinating species best suited for experienced aquarists who can provide the highly specific blackwater conditions it requires. Its shimmering display, unique markings, and secretive nature make it a gem in any dedicated nano or species tank.
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