Congo Tetra – Phenacogrammus interruptus
The Congo Tetra (Phenacogrammus interruptus) is a peaceful African schooling fish from the lower and middle Congo River basin. Adults develop a metallic blue, green and gold sheen, while mature males can develop extended fins.
This listing is for 1 Congo Tetra. Congo Tetras are schooling fish, so purchase enough fish or add to an established suitable group to keep at least 6 together.
Care guide
| Scientific name | Phenacogrammus interruptus |
| Family | Alestidae (African tetras) |
| Origin | Lower and middle Congo River basin, Central Africa |
| Adult size | Usually 6–8cm; males can reach about 8cm |
| Temperament | Peaceful and active; keep in a group of at least 6 |
| Temperature | 23–27°C |
| pH | 6.0–7.5 |
| Hardness | 3–18 dGH |
| Minimum aquarium | About 120 litres with at least 100cm swimming length for a group |
| Diet | Omnivorous; quality flakes or small pellets plus frozen or live foods |
Feeding
Offer a varied diet of quality flake or small pellets, supported with foods such as daphnia, brine shrimp and bloodworm. Feed modest portions and remove uneaten food.
Tank setup
Provide open swimming space alongside planted areas, driftwood and a darker substrate. Congo Tetras are active swimmers and benefit from a long aquarium with clean, well-oxygenated water and a secure lid.
Compatibility
Suitable companions include peaceful tetras, rainbowfish, Corydoras, smaller peaceful barbs and similarly sized community fish. Avoid aggressive tank mates and persistent fin-nippers.
Health and acclimation
Keep ammonia and nitrite at 0 ppm and maintain nitrate at a low level with regular water changes. Acclimate gradually and avoid sudden changes in temperature or water chemistry.
Frequently asked questions
Is the Congo Tetra a Neon Tetra?
No. The Congo Tetra is Phenacogrammus interruptus, an African tetra in the family Alestidae. Neon Tetras are a different South American species.
Can Congo Tetras be kept alone?
No. They are social schooling fish and should be kept in groups of at least six.
Are Congo Tetras suitable for a community aquarium?
Yes, when housed with peaceful fish of a similar size and given adequate swimming space.
1 review for Congo Tetra – Phenacogrammus interruptus
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Emily Parker (verified owner) –
I’ve recently added the Congo Tetra to my aquarium, and I couldn’t be happier with my choice! These vibrant fish not only bring a burst of color but also display such lively behavior that it makes watching them a joy. I’ve had them for about two months now, and their adaptability has been remarkable. They swim gracefully around the driftwood and plants, creating a stunning visual in my community tank.
What I appreciate most is their peaceful nature, which makes them perfect for my mixed freshwater fish setup. Compared to the previous tetras I had, the Congos are much more active and social, often schooling together in the most beautiful formations.
I did have a minor concern regarding their need for slightly warmer water, but it was easy to adjust my heater accordingly. If you’re considering adding a splash of life to your aquarium, I highly recommend the Congo Tetra. They thrive in well-planted tanks with plenty of hiding spots, so make sure to have some driftwood and plants ready to create their ideal environment. Overall, a fantastic choice for any aquarist wanting to create a vibrant underwater community!