The Congo Tetra, scientifically known as Phenacogrammus interruptus, is a vibrant and lively freshwater fish that adds a splash of color and elegance to any aquarium. Native to the Congo River basin in Africa, this species is cherished by aquarists for its striking iridescent coloration, flowing fins, and peaceful demeanor. The Congo Tetra is a testament to the beauty and diversity of African riverine fish, making it a favored choice for community aquariums.

Overview and Appearance:
- Scientific Name: Phenacogrammus interruptus
- Family: Alestidae
- Size: Up to 3-3.5 inches (7.5-8.5 cm)
- Lifespan: 3-5 years in optimal conditions

Congo Tetras are known for their shimmering scales, which reflect light to reveal a spectrum of colors, from deep blue and purple to vibrant red and gold. Males are particularly impressive with their extended dorsal and caudal fins, which flow elegantly as they swim. Females are slightly duller and have shorter fins but share the same captivating iridescence.

Habitat and Tank Requirements:
To keep Congo Tetras healthy and content, their tank should resemble their natural habitat as closely as possible:
- Water Parameters: Slightly acidic to neutral pH (6.0-7.5), with a temperature range of 73-81°F (23-27°C).
- Tank Setup: A minimum tank size of 30 gallons to accommodate a small school comfortably. The aquarium should be densely planted with areas of open water for swimming. A dark substrate can help to enhance their natural colors.
- Filtration: Efficient filtration is required to maintain clean water, but water flow should be moderate to mimic their natural calm river environments.

Diet and Nutrition:
Congo Tetras are omnivorous and thrive on a varied diet:
- A staple diet of high-quality flake or pellet food.
- Regular servings of live or frozen foods such as brine shrimp, bloodworms, or daphnia to promote health and color vibrancy.
- Occasional vegetable matter to provide a balanced diet.

Behavior and Compatibility:
Congo Tetras are peaceful and sociable fish, making them excellent candidates for community tanks:
- Best kept in groups of at least 6-8 individuals to encourage natural schooling behavior and reduce stress.
- Suitable tank mates include other peaceful, similarly sized fish such as larger tetras, rasboras, or dwarf cichlids.
- Avoid keeping with aggressive species or fin-nippers that may stress or harm them.

Breeding:
Breeding Congo Tetras can be a rewarding experience for the dedicated aquarist:
- They require specific water conditions, including soft, slightly acidic water.
- A separate breeding tank with fine-leaved plants or a spawning mop is recommended.
- After spawning, parents should be removed to prevent them from eating the eggs.
- Fry are delicate and require infusoria or commercially available fry food initially.

The Congo Tetra is more than just an aquarium fish; it's a living piece of art. With its peaceful nature and dazzling colors, it brings a piece of African river life into the homes of hobbyists. By providing the right environment, a balanced diet, and suitable tank mates, aquarists can ensure these stunning fish thrive, offering a glimpse into the vibrant underwater world of the Congo River basin. Whether you are a seasoned aquarist or new to the hobby, the Congo Tetra is a delightful addition that promises to bring beauty and grace to any freshwater aquarium.