Penguin Tetra Care Guide
The Penguin Tetra (Thayeria boehlkei) is a distinctive and peaceful freshwater fish popular among UK aquarists. Known for its bold black stripe and unique angled swimming posture, it is an attractive and active schooling species that works well in community aquariums.
In this guide, you'll learn everything you need to know about Penguin Tetra care, including tank size, water conditions, compatibility, feeding, and typical UK prices - plus how to buy or sell them locally.
Quick facts about Penguin Tetras
Penguin tetras are native to the Amazon Basin in South America. Their most recognisable feature is the black stripe that runs from the nose through the body and into the lower tail fin, creating a penguin-like appearance.
They are unusual among tetra species because they often swim with their heads slightly tilted upwards, giving them a distinctive and charming character.
Thayeria boehlkei
5-7 cm
Brazil and Peru
75L (20gal)
5-7 years
Peaceful, active, schooling
23-28°C
Omnivore (flakes, pellets, frozen and live foods)
6.0-7.5
£2-£6 per fish
How Many Penguin Tetras Should You Keep?
Penguin tetras are schooling fish and should always be kept in groups.
- A minimum group of 6-8 is recommended
- Groups of 10 or more encourage natural behaviour and confidence
- Larger schools create a striking display as they swim together
Keeping too few can result in:
- Nervous behaviour
- Increased stress
- Occasional fin-nipping
They are most relaxed and attractive when maintained in sizeable groups.
Ideal Tank Conditions for Penguin Tetras
Providing the right environment helps penguin tetras display their best colours and behaviour.
- Tank Setup: Community aquarium with open swimming space
- Substrate: Dark substrate enhances colour contrast
- Plants & Decor: Dense planting, driftwood, and shaded areas
- Water Conditions: Stable freshwater with excellent water quality
- Filtration & Flow: Gentle to moderate filtration
- Lighting: Moderate lighting
They enjoy a balance of swimming space and planted cover.
Compatibility with Other Fish
Penguin tetras are peaceful and suitable for a wide range of community aquariums.
- Good Tankmates: black neon tetras, diamond tetras, Congo tetras, harlequin rasboras, honey gouramis, corydoras catfish, and kuhli loaches
- Avoid: large predatory fish, highly aggressive cichlids, and species likely to view them as food
Their active nature makes them ideal companions for similarly energetic community fish.
Are Penguin Tetras Easy to Care For?
Penguin tetras are easy to care for and suitable for beginners.
They require:
- Stable water quality
- Proper shoal sizes
- Regular feeding
- A peaceful environment
They are hardy and adapt well to most established community aquariums.
Penguin Tetra Price in the UK
In the UK, penguin tetras typically cost between £2-£6 per fish.
Prices vary depending on:
- Size and age
- Availability
- Shop vs hobbyist breeders
They are affordable and commonly available from tropical fish retailers.
Where to Buy Penguin Tetras in the UK
Penguin tetras are available from many aquarium shops and specialist tropical fish suppliers.
Sourcing fish locally can:
- Reduce transport stress
- Allow you to inspect health and condition
- Offer better value
TankMate UK helps connect fishkeepers who want to buy, sell, or rehome fish safely - without shipping.
Can You Sell Penguin Tetras?
Yes - penguin 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 Penguin Tetras
Penguin tetras are omnivorous and enthusiastic feeders.
Key Tips
- Feed high-quality flakes or micro pellets
- Supplement with frozen bloodworms, daphnia, and brine shrimp
- Offer occasional live foods
- Feed small portions 1-2 times daily
A varied diet helps maintain health, colouration, and breeding condition.
Common Problems with Penguin Tetras
Faded colours, often caused by:
- Stress
- Poor diet
- Poor water quality
Shy behaviour, linked to:
- Small shoal sizes
- Lack of cover
- Inappropriate tankmates
Minor fin-nipping, caused by:
- Insufficient group sizes
- Overcrowding
Why Penguin Tetras Are So Popular
- Distinctive black stripe and penguin-like appearance
- Unique angled swimming posture
- Peaceful and community-friendly
- Excellent schooling behaviour
- Hardy and beginner-friendly
When kept correctly, penguin tetras provide constant movement and character, making them a fascinating addition to community aquariums.
Frequently Asked Questions
The black stripe extending into the tail resembles the markings of a penguin.
Their characteristic head-up swimming posture is completely normal and one of the species' defining traits.
At least 6-8, although larger schools are highly recommended.
At least 75 litres, with plenty of swimming space and a suitable shoal.
Looking to Buy or Sell Penguin Tetras Locally?
TankMate UK connects fishkeepers who want to buy, sell, or rehome fish safely within their local area.
Whether you're building a peaceful community 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.