X-Ray Tetra Care Guide
The X-Ray Tetra (Pristella maxillaris), also known as the Pristella Tetra, is a peaceful and hardy freshwater fish popular among UK aquarists. Known for its translucent body, striking black, yellow, and white fin markings, and adaptability, it is an excellent schooling fish for community aquariums.
In this guide, you'll learn everything you need to know about X-Ray Tetra care, including tank size, water conditions, compatibility, feeding, and typical UK prices - plus how to buy or sell them locally.
Quick facts about X-Ray Tetras
X-Ray Tetras are native to the coastal river systems of South America. Their transparent body allows parts of their internal anatomy to be visible, giving rise to their unusual common name.
They are one of the most adaptable tetra species available and can tolerate a wider range of water conditions than many of their relatives.
Pristella maxillaris
4-5 cm
Venezuela, Guyana, Brazil, and surrounding regions
60L (15gal)
4-6 years
Peaceful, schooling
22-28°C
Omnivore (flakes, pellets, frozen and live foods)
6.0-8.0
£2-£5 per fish
How Many X-Ray Tetras Should You Keep?
X-Ray 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 beautiful display of coordinated swimming
Keeping too few can lead to:
- Stress and nervous behaviour
- Reduced activity
- Increased susceptibility to illness
They are most comfortable when maintained in sizeable shoals.
Ideal Tank Conditions for X-Ray Tetras
Providing the right environment helps X-Ray Tetras remain healthy and display their best colours.
- Tank Setup: Community aquarium with open swimming areas
- Substrate: Dark substrate helps highlight their translucent appearance
- Plants & Decor: Dense planting, driftwood, and shaded areas
- Water Conditions: Stable freshwater with good water quality
- Filtration & Flow: Gentle to moderate filtration
- Lighting: Moderate lighting
They adapt well to a variety of aquarium styles, from planted tanks to traditional community setups.
Compatibility with Other Fish
X-Ray Tetras are peaceful and make excellent community fish.
- Good Tankmates: black neon tetras, glowlight tetras, harlequin rasboras, honey gouramis, corydoras catfish, kuhli loaches, and cherry shrimp
- Avoid: large predatory fish and highly aggressive species
Their calm nature makes them suitable for a wide range of community aquariums.
Are X-Ray Tetras Easy to Care For?
X-Ray Tetras are very easy to care for and are ideal for beginners.
They require:
- Stable water quality
- Appropriate shoal sizes
- Regular feeding
- Peaceful tankmates
Their adaptability makes them one of the most forgiving tetra species available.
X-Ray Tetra Price in the UK
In the UK, X-Ray Tetras typically cost between £2-£5 per fish.
Prices vary depending on:
- Size and age
- Availability
- Shop vs hobbyist breeders
They are affordable and widely available.
Where to Buy X-Ray Tetras in the UK
X-Ray Tetras are available from most aquarium shops and tropical fish retailers.
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 X-Ray Tetras?
Yes - X-Ray 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 X-Ray Tetras
X-Ray Tetras are omnivorous and easy to feed.
Key Tips
- Feed high-quality flakes or micro pellets
- Supplement with frozen daphnia, cyclops, bloodworms, and brine shrimp
- Offer occasional live foods
- Feed small portions 1-2 times daily
A varied diet helps maintain health and encourages breeding behaviour.
Common Problems with X-Ray Tetras
Faded colours, often caused by:
- Poor diet
- Stress
- Poor water quality
Shy behaviour, linked to:
- Small shoal sizes
- Lack of cover
- Inappropriate tankmates
Disease outbreaks, caused by:
- Poor maintenance
- Sudden parameter changes
- Introduction of unquarantined fish
Why X-Ray Tetras Are So Popular
- Unique translucent body
- Hardy and adaptable
- Peaceful community fish
- Excellent schooling behaviour
- Ideal for beginners and experienced aquarists alike
When kept correctly, X-Ray Tetras provide a fascinating and attractive display that works beautifully in almost any community aquarium.
Frequently Asked Questions
Their partially transparent bodies allow internal structures to be seen, creating an "x-ray" effect.
Yes, they are among the hardiest and easiest tetra species to keep.
At least 6-8, although larger shoals are strongly recommended.
At least 60 litres, with plenty of swimming space and a suitable shoal.
Looking to Buy or Sell X-Ray Tetras Locally?
TankMate UK connects fishkeepers who want to buy, sell, or rehome fish safely within their local area.
Whether you're creating 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.