Moenkhausia costae is a medium-sized tetra, reaching a length of approximately 5–6 cm. Its most distinctive feature is a dark horizontal stripe on the tail, often highlighted by a contrasting light coloration above and below the line. Combined with shiny scales and translucent fins, this gives the fish a very elegant and attractive appearance.
This is a shoaling species – in the wild, they form large groups to protect themselves from predators. In captivity, they should be kept in groups of at least five, preferably more. They are very active, constantly swimming in the middle and upper levels of the tank, bringing a lively and dynamic atmosphere to the aquarium.
Aquarium conditions:
-
Water temperature: 22–26 °C
-
pH: 6.0–7.5
-
Water hardness: Soft to medium-hard
-
Decoration: A planted aquarium with open swimming space; darker substrate helps enhance their coloration
-
Filtration: Moderate, with sufficient water movement
-
Cover: Recommended – they may jump
Moenkhausia costae is not demanding when it comes to food. It readily accepts standard flake and granulated foods, but will also appreciate live or frozen options such as bloodworms, daphnia, or brine shrimp. A varied diet helps to enhance their natural colors and overall health.
This species is peaceful and social, making it suitable for community tanks with other calm fish of similar size. They should not be kept with aggressive or very slow-moving species, as their fast swimming might cause stress.
Moenkhausia costae is a beautiful and fascinating species for aquarists who are looking for a less common yet hardy schooling fish for a community or planted aquarium. Their shiny bodies, bold black stripe, and constant movement make them a true gem in any tank.
