Black Ruby Barbs (Pethia nigrofasciata) are a striking freshwater fish species known for their vibrant coloration and peaceful nature. Here's some information about Black Ruby Barbs:

Black Ruby Barbs have an elongated and slightly compressed body shape. They can grow up to 2.5 to 3 inches (6 to 7.0 cm) in length. As their name suggests, they have a deep black coloration that covers most of their body. Males typically display brighter colors and may develop a reddish or orange hue on their fins and belly. Females are generally less colorful, with a more subdued black shade.

Black Ruby Barbs are native to Myanmar (Burma) and are found in slow-moving streams and rivers. They prefer slightly acidic to neutral water conditions, with temperatures ranging from 72°F to 79°F (22°C to 26°C). Providing plants and driftwood in the aquarium helps replicate their natural habitat.

Black Ruby Barbs are generally peaceful and social fish. They are best kept in small groups of five or more individuals. Keeping them in a larger school helps to reduce aggression and allows them to exhibit their natural shoaling behavior. They can coexist with other peaceful fish species in a community aquarium.

Black Ruby Barbs are relatively easy to care for. They require a well-maintained aquarium with plenty of swimming space and hiding spots. Providing live or artificial plants, along with some open swimming areas, will help create a balanced environment. Regular water changes and maintenance of good water quality are important for their well-being.

Black Ruby Barbs are omnivorous and accept a wide range of foods. They can be fed high-quality flake or pellet food as a staple diet. Supplementing their diet with live or frozen foods such as brine shrimp, bloodworms, daphnia, or small insects is beneficial. Including some vegetable matter in their diet, such as spirulina-based foods or blanched vegetables, is also recommended.

Black Ruby Barbs are generally peaceful and can coexist with other peaceful community fish. They may display some fin-nipping behavior towards fish with long, flowing fins, so it's best to avoid keeping them with delicate or slow-moving species. Suitable tankmates include tetras, rasboras, peaceful barbs, danios, and other similarly sized fish.

Black Ruby Barbs can be bred in captivity. To encourage breeding, provide them with a well-conditioned pair or a small group of males and females. They prefer slightly acidic and soft water conditions for spawning. The female will scatter the eggs among plants, and both parents do not exhibit parental care. After spawning, it's advisable to remove the parents from the breeding tank to prevent them from eating the eggs.

Black Ruby Barbs add a vibrant touch to any community aquarium with their striking black coloration. They are relatively hardy and peaceful, making them suitable for beginner and experienced aquarists alike. With proper care, suitable tank conditions, and compatible tankmates, they can thrive and become a focal point in your aquatic setup.