Red-Tailed Black Shark Care Guide
The red-tailed black shark (Epalzeorhynchos bicolor) is a striking and popular tropical freshwater fish in the UK. Known for its jet-black body and vivid red tail, it's a bold and active species often chosen as a centrepiece fish.
In this guide, you'll learn everything you need to know about red-tailed black shark care, including tank size, water conditions, compatibility, behaviour, and typical UK prices - plus how to buy or sell them locally.
Quick facts about Red-Tailed Black Sharks
Red-tailed black sharks are freshwater fish native to Thailand. Despite their name, they are not true sharks but belong to the carp family.
They are known for their territorial nature and should be housed carefully with compatible tankmates.
Epalzeorhynchos bicolor
12-15 cm
Thailand
150-200L (40-55gal)
5-8 years
Semi-aggressive, territorial
24-28°C
Omnivore (flakes, pellets, algae, frozen foods)
6.5-7.5
£5-£10 per fish
How Many Red-Tailed Black Sharks Should You Keep?
Red-tailed black sharks are best kept alone.
- A single fish is strongly recommended
- Avoid keeping multiple sharks unless the tank is very large and carefully structured
Keeping more than one in a typical aquarium can lead to:
- Aggression and chasing
- Territorial disputes
- Injury or stress
They are highly territorial, especially towards similar-shaped fish.
Ideal Tank Conditions for Red-Tailed Black Sharks
Creating a structured environment is key to managing their behaviour and keeping them healthy.
- Tank Setup: Provide plenty of hiding spaces and defined territories
- Substrate: Sand or fine gravel works well
- Plants & Decor: Include rocks, driftwood, caves, and plants to break line of sight
- Water Conditions: Slightly soft to neutral water is ideal
- Filtration & Flow: Moderate flow with good filtration is recommended
- Lighting: Moderate lighting is suitable
A well-decorated tank helps reduce aggression.
Compatibility with Other Fish
Red-tailed black sharks can be kept in community aquariums, but careful tankmate selection is essential.
- Good Tankmates: fast-moving fish such as barbs, danios, rainbowfish, and larger tetras
- Avoid: other bottom-dwellers, similar-shaped fish (like other sharks or loaches), and slow or timid species
They may chase fish that enter their territory, particularly near the bottom.
Are Red-Tailed Black Sharks Easy to Care For?
Red-tailed black sharks are moderately easy to care for but are better suited to aquarists with some experience.
They require:
- A sufficiently large tank
- Thoughtful aquascaping to reduce aggression
- Compatible tankmates
- Stable water conditions
Their behaviour is the main challenge rather than their basic care needs.
Red-Tailed Black Shark Price in the UK
In the UK, red-tailed black sharks typically cost between £5-£10 per fish.
Prices vary depending on:
- Size and condition
- Availability
- Shop vs hobbyist sellers
They are widely available and generally affordable.
Where to Buy Red-Tailed Black Sharks in the UK
Red-tailed black sharks are commonly available in UK aquarium shops, but many fishkeepers choose to source them locally.
Sourcing fish locally can:
- Reduce transport stress
- Improve survival rates
- Offer better value
TankMate UK helps connect fishkeepers who want to buy, sell, or rehome fish safely - without shipping.
Can You Sell Red-Tailed Black Sharks?
Yes - red-tailed black sharks are often rehomed by aquarists, particularly if compatibility issues arise.
Selling locally is often the best option, as it:
- Minimises stress for the fish
- Avoids the risks of shipping
- Helps ensure suitable homes
TankMate UK allows you to list fish quickly and find local buyers.
Feeding Red-Tailed Black Sharks
Red-tailed black sharks are omnivorous and will accept a wide range of foods.
Key Tips:
- Feed high-quality flakes or pellets
- Supplement with algae wafers and vegetables
- Offer occasional frozen or live foods
- Ensure food reaches the bottom of the tank
- A varied diet supports health and colouration.
Common Problems with Red-Tailed Black Sharks
Aggression and chasing, often caused by:
- Small tank size
- Poor tankmate selection
- Lack of hiding spaces
Stress or hiding, linked to:
- Overcrowding
- Inadequate territory
Poor condition, caused by:
- Poor water quality
- Inadequate diet
Why Red-Tailed Black Sharks Are So Popular
- Striking black and red colour contrast
- Active and engaging behaviour
- Great centrepiece fish
- Widely available and affordable
- Adds movement to the lower levels of the tank
When kept correctly, they bring bold colour and personality to an aquarium.
Frequently Asked Questions
Not usually-best kept singly due to territorial behaviour.
They are semi-aggressive and territorial, especially towards similar fish.
Yes, they will graze algae but still require a varied diet.
At least 150-200 litres, with plenty of space and structure.
Looking to Buy or Sell Red-Tailed Black Sharks Locally?
TankMate UK connects fishkeepers who want to buy, sell, or rehome fish safely within their local area.
Whether you're stocking your aquarium or passing fish on to a new home, 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.