Congo Tetra

The Congo Tetra is one of the most elegant and beautiful tetras available in the aquarium hobby. Males display spectacular long, flowing fins with iridescent rainbow colors including blue, green, gold, and red. Native to the Congo River basin in Africa, these peaceful fish make stunning additions to community aquariums. They require clean, well-maintained water and appreciate dimmed lighting. While relatively hardy, they are sensitive to poor water conditions and should be kept in schools of 6 or more.

Care Requirements

Tank Setup

Congo Tetras need space for their long fins and appreciate planted environments.

Essential Setup:

• 30+ gallons minimum
• Dimmed lighting (brings out colors)
• Plenty of plants
• Dark substrate
• Gentle filtration

Water Quality

• Temperature: 73-81°F (23-27°C)
• pH: 6.0-7.5
• Water Hardness: Soft to moderate (3-12 dGH)
• Ammonia/Nitrite: 0 ppm
• Nitrate: <15 ppm

These fish are sensitive to water quality. Pristine conditions essential.

Feeding

Omnivores that prefer variety:

• Quality flakes or pellets
• Frozen foods: bloodworms, brine shrimp
• Live foods enhance color
• Vegetable matter appreciated

Behavior & Compatibility

Very peaceful and shy:

• School size: 6+ minimum, 10+ ideal
• Tank mates: Only peaceful species
• Lighting: Prefer dimmed conditions
• Dither fish: Help them feel secure

Good Tank Mates:

• Rainbowfish
• Pearl Gourami
• Corydoras
• Other peaceful tetras

Avoid:

• Fin nippers (will target long fins)
• Aggressive fish
• Bright lighting without plant cover

Sexual Dimorphism

• Males: Long flowing fins, more colorful
• Females: Shorter fins, less color, fuller body
• Ratio: 1:1 or 2:3 male to female

Breeding

Challenging but possible:

• Soft, acidic water triggers spawning
• Fine-leaved plants for eggs
• Remove adults after spawning
• Feed fry infusoria