The Lipstick Tetra, scientifically known as Moenkhausia cosmops, is a captivating and relatively rare species of freshwater fish native to the clear, fast-flowing rivers of the Amazon Basin in Brazil. This species is highly prized by aquarists for its unique appearance, peaceful demeanor, and active behavior, making it an excellent addition to well-maintained community aquariums.

Lipstick Tetras are characterized by their elongated, streamlined bodies and striking coloration. Their bodies typically display a shimmering silver base color, accented with a distinctive red or pink "lipstick" marking around their mouths. Additionally, they have a striking iridescent blue spot near the base of their tail, which adds to their overall visual appeal. Their fins are generally transparent or slightly tinted, complementing their elegant appearance.

In captivity, Lipstick Tetras thrive in aquariums that closely mimic their natural habitat. A tank setup should include a soft, sandy or fine gravel substrate and plenty of live plants, such as Java moss, Anubias, and Amazon swords, which provide cover and create a comfortable environment. Adding driftwood and rocks can enhance the natural look of the tank and provide additional hiding spots.

Water conditions should be slightly acidic to neutral, with moderate hardness. Maintaining stable water parameters through regular water changes and efficient filtration is crucial for the health and well-being of Lipstick Tetras. They are relatively hardy fish but do best in clean, well-oxygenated water with a gentle to moderate current.

Lipstick Tetras are schooling fish that should be kept in groups of at least six or more to promote their well-being and natural schooling behavior. Keeping them in a school not only reduces stress but also enhances their vibrant colors and active swimming patterns. They are peaceful and can be housed with other small, non-aggressive fish, making them ideal for community tanks.

Their diet should be varied to ensure they receive all necessary nutrients. Lipstick Tetras are omnivorous and will readily accept high-quality flake foods, micro pellets, and live or frozen foods such as brine shrimp, daphnia, and bloodworms. Providing a mix of these foods will help maintain their health, vibrant colors, and energetic behavior.

Breeding Lipstick Tetras in captivity can be relatively straightforward under the right conditions. They are egg scatterers, typically laying their eggs among fine-leaved plants or in spawning mops. To encourage breeding, maintain optimal water conditions with slightly acidic water and provide plenty of fine-leaved plants or spawning mops. Once spawning occurs, it is advisable to remove the adults from the breeding tank to prevent them from eating the eggs. The eggs usually hatch within a few days, and the fry can be fed with infusoria or finely crushed flake food until they are large enough to accept standard fare.

Overall, the Lipstick Tetra is an excellent choice for aquarists looking for a colorful, peaceful, and active species. Their striking appearance, gentle nature, and ease of care make them a delightful addition to any well-maintained community aquarium. With proper care, they can thrive and bring a touch of vibrant beauty and lively activity to your aquatic setup.