Overview
The Congo tetra lives in the Congo River basin in central Africa, one of the biggest and most powerful river systems on Earth. It is larger than most tetras and famous for its glowing colors, which shift from blue to gold to orange as it moves through the light. Males also grow long, flowing tail and fin edges that look like delicate feathers.
Congo tetras are peaceful schooling fish that shine brightest, in every sense, when they swim together in a group. A shoal of them moving across a planted tank looks like a living rainbow. They are a bit shy on their own, so a big school helps them feel safe enough to show off their best colors.
| Care level | Easy |
| Adult size | 3-3.5 in (8-9 cm) |
| Lifespan | 3-5 years |
| Temperament | Peaceful |
| Min. tank | 30 gal (115 L) |
| Temperature | 73-82°F (23-28°C) |
| pH | 6.0-7.5 |
| Diet | Omnivore |
| Schooling | Yes, keep 6 or more |
Water and tank
These active swimmers need room to move, so a tank of at least 30 gallons is best for a proper school. Soft, slightly acidic water suits them well, matching the tannin-stained rivers of the Congo. Keep the water clean and well filtered with a gentle current.
Aquascape and setup
A darker substrate and plenty of live plants make the Congo tetra's colors pop and help it feel secure. Leave open water in the middle of the tank for swimming. Adding driftwood or dried leaves can tint the water slightly, which mimics their wild home.
Diet
Congo tetras are omnivores with healthy appetites. Feed a mix of quality flakes or pellets plus frozen and live treats like bloodworms, daphnia, and brine shrimp. A varied diet keeps their bright colors and long fins in top shape.
Tankmates and temperament
They are gentle and mix well with other peaceful fish of similar size, such as rainbowfish, larger tetras, and calm cichlids. Avoid tiny nippy fish that might nibble their flowing fins, and skip aggressive tankmates that would bully these easygoing swimmers.
Fins that grow with age
Young Congo tetras look fairly plain, so their true beauty takes time. As males mature, they develop the long, feathery fin extensions and full rainbow shimmer. Good food, clean water, and a calm home all help them reach their most spectacular look.
Fun facts
- Congo tetras come from the mighty Congo River basin in central Africa.
- Males grow long, feathery fin extensions that females do not have.
- Their scales shimmer through blue, gold, and orange as light hits them.
- They are larger than most tetras, reaching about 3 inches.
- A big school brings out their brightest colors and boldest behavior.
Frequently asked questions
How many Congo tetras should I keep?
At least six. They are schooling fish that feel safe and look their best in a group. A larger shoal is calmer, bolder, and much more colorful.
Why are my Congo tetras not very colorful?
They may be young or stressed. Colors deepen with age, a good varied diet, clean water, a darker background, and the safety of a full school.
Are Congo tetras aggressive?
No, they are peaceful. Just avoid keeping them with fin-nipping fish, since their long, delicate fins can get nibbled.
What size tank do Congo tetras need?
About 30 gallons or more. They are active swimmers that grow larger than most tetras and need open space to school and roam.
