Congo Tetra Care Guide
The Congo Tetra (Phenacogrammus interruptus) is one of the most spectacular freshwater schooling fish available to UK aquarists. Known for its iridescent rainbow colours, flowing fins, and graceful swimming behaviour, it is widely regarded as one of the most beautiful tetra species in the aquarium hobby.
In this guide, you'll learn everything you need to know about Congo Tetra care, including tank size, water conditions, compatibility, feeding, and typical UK prices - plus how to buy or sell them locally.
Quick facts about Congo Tetras
Congo tetras are native to the Congo River Basin in Central Africa. Mature males develop shimmering rainbow coloration that can display shades of blue, gold, purple, green, and orange depending on the lighting.
They are peaceful schooling fish that thrive in spacious, well-planted aquariums.
Phenacogrammus interruptus
7-10 cm
Congo River Basin (Central Africa)
120L (30gal)
5-8 years
Peaceful, schooling
23-28°C
Omnivore (flakes, pellets, frozen and live foods)
6.0-7.5
£5-£15 per fish
How Many Congo Tetras Should You Keep?
Congo tetras are schooling fish and should always be kept in groups.
- A minimum group of 6 is recommended
- Groups of 8-12 allow natural social behaviour
- Larger schools encourage stronger colouration and confidence
Keeping too few can result in:
- Stress and nervous behaviour
- Reduced colouration
- Increased shyness
They are most impressive when kept in sizeable schools.
Ideal Tank Conditions for Congo Tetras
Providing the right environment helps Congo tetras display their stunning colours and natural behaviour.
- Tank Setup: Spacious planted aquarium with open swimming areas
- Substrate: Dark substrate enhances their iridescent colours
- Plants & Decor: Driftwood, tall plants, floating plants, and shaded areas
- Water Conditions: Soft to moderately hard stable freshwater
- Filtration & Flow: Gentle to moderate filtration
- Lighting: Moderate lighting with some shaded areas
A mature aquarium with stable water parameters helps them thrive.
Compatibility with Other Fish
Congo tetras are peaceful and excellent community fish.
- Good Tankmates: African tetras, rainbowfish, pearl gouramis, corydoras catfish, synodontis catfish, keyhole cichlids, and peaceful loaches
- Avoid: fin-nipping species such as tiger barbs and highly aggressive cichlids
Their long flowing fins can make them targets for persistent fin-nippers.
Are Congo Tetras Easy to Care For?
Congo tetras are moderately easy to care for and suitable for aquarists with some experience.
They require:
- Stable water quality
- Appropriate shoal sizes
- Plenty of swimming space
- A varied diet
They are hardy once settled but dislike sudden changes in water conditions.
Congo Tetra Price in the UK
In the UK, Congo tetras typically cost between £5-£15 per fish.
Prices vary depending on:
- Size and maturity
- Sex (males often command higher prices)
- Availability
- Shop vs hobbyist breeders
Fully coloured adult males are usually the most expensive.
Where to Buy Congo Tetras in the UK
Congo tetras are available from many aquarium shops and specialist tropical fish retailers.
Sourcing fish locally can:
- Reduce transport stress
- Allow you to inspect colouration and health
- Offer better value
TankMate UK helps connect fishkeepers who want to buy, sell, or rehome fish safely - without shipping.
Can You Sell Congo Tetras?
Yes - Congo tetras are occasionally bred and sold by hobbyists.
Selling locally is often the best option, as it:
- Minimises stress for the fish
- Avoids the risks of shipping
- Connects you with local aquarists
TankMate UK allows you to list fish quickly and find local buyers.
Feeding Congo Tetras
Congo tetras are omnivorous and enthusiastic feeders.
Key Tips
- Feed high-quality flakes or small pellets
- Supplement with frozen bloodworms, daphnia, and brine shrimp
- Offer occasional live foods for conditioning
- Feed small portions 1-2 times daily
A varied diet helps maximise colouration and maintain finnage quality.
Common Problems with Congo Tetras
Faded colours, often caused by:
- Stress
- Poor water quality
- Inadequate diet
Fin damage, linked to:
- Fin-nipping tankmates
- Poor aquarium conditions
Shy behaviour, caused by:
- Small shoal sizes
- Lack of cover
- Frequent disturbances
Why Congo Tetras Are So Popular
- Spectacular rainbow iridescence
- Graceful flowing fins
- Peaceful community fish
- Excellent schooling behaviour
- One of the most beautiful tetra species available
When kept correctly, Congo tetras create a dazzling display of colour and movement that rivals many marine fish for beauty.
Frequently Asked Questions
Most adults reach between 7-10 cm in length.
No, they are peaceful schooling fish suitable for community aquariums.
At least 6, although groups of 8-12 are ideal.
At least 120 litres, with plenty of swimming space and a suitable shoal.
Looking to Buy or Sell Congo Tetras Locally?
TankMate UK connects fishkeepers who want to buy, sell, or rehome fish safely within their local area.
Whether you're building a stunning African-themed aquarium or looking to rehome fish responsibly, you can:
- Browse fish available near you
- List your own fish in minutes
- Avoid the risks of shipping
Explore local listings with TankMate UK and find the right fish for your aquarium.