Black Ruby Barb Care Guide
The Black Ruby Barb (Pethia nigrofasciata) is a colourful and active tropical freshwater fish popular in the UK. Known for its deep red and black colouration-especially in males during breeding-it's a striking addition to community aquariums.
In this guide, you'll learn everything you need to know about Black Ruby Barb care, including tank size, water conditions, compatibility, feeding, and typical UK prices - plus how to buy or sell them locally.
Quick facts about Black Ruby Barbs
Black Ruby Barbs are small schooling fish native to Sri Lanka. They are most vibrant in well-maintained tanks and display deeper colours as they mature.
They are peaceful compared to some other barbs but still active and best kept in groups.
Pethia nigrofasciata
5-6 cm
Sri Lanka
75L (20gal)
4-6 years
Peaceful, active, shoaling
23-27°C
Omnivore (flakes, pellets, frozen, live foods)
6.0-7.5
£2-£4 per fish
How Many Black Ruby Barbs Should You Keep?
Black Ruby Barbs are shoaling fish and should always be kept in groups.
- Minimum group size of 6
- Groups of 8-10+ are ideal
- Larger groups reduce aggression and improve colour display
Keeping too few can lead to:
- Fin-nipping
- Stress and dull colouration
- Aggressive behaviour
In proper groups, they are lively and social.
Ideal Tank Conditions for Black Ruby Barbs
Providing the right environment helps bring out their best colour and behaviour.
- Tank Setup: Well-planted aquarium with open swimming areas
- Substrate: Dark substrate helps enhance colour
- Plants & Decor: Dense planting with driftwood and shaded areas
- Water Conditions: Slightly soft, slightly acidic water preferred
- Filtration & Flow: Moderate flow with good filtration
- Lighting: Dim to moderate lighting enhances colouration
A more natural, shaded setup suits them well.
Compatibility with Other Fish
Black Ruby Barbs are generally peaceful but should be kept with suitable tankmates.
- Good Tankmates: tetras, rasboras, corydoras, loaches, and other peaceful community fish
- Avoid: very slow or long-finned fish (risk of nipping), and aggressive species
They are less nippy than tiger barbs but still benefit from proper grouping.
Are Black Ruby Barbs Easy to Care For?
Black Ruby Barbs are easy to moderately easy to care for and suitable for beginners.
They require:
- A proper group size
- Stable, clean water
- A planted tank environment
- A varied diet
They are hardy but display best colour in good conditions.
Black Ruby Barb Price in the UK
In the UK, Black Ruby Barbs typically cost between £2-£4 per fish.
Prices vary depending on:
- Size and maturity (males colour up more)
- Availability
- Shop vs hobbyist sellers
They are affordable and widely available.
Where to Buy Black Ruby Barbs in the UK
Black Ruby Barbs are available in many UK aquarium shops and from private sellers.
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 Black Ruby Barbs?
Yes - Black Ruby Barbs are sometimes 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 responsible aquarists
TankMate UK allows you to list fish quickly and find local buyers.
Feeding Black Ruby Barbs
Black Ruby Barbs are omnivorous and require a varied diet.
Key Tips:
- Feed high-quality flakes or micro pellets
- Supplement with frozen or live foods (e.g. bloodworms, daphnia)
- Include some plant-based foods
- Feed small amounts regularly
- A varied diet enhances colour and health.
Common Problems with Black Ruby Barbs
Fin-nipping, often caused by:
- Too small a group
- Boredom or stress
Dull colouration, linked to:
- Poor diet
- Stress
- Inadequate tank conditions
Aggression, caused by:
- Improper stocking
- Incompatible tankmates
Why Black Ruby Barbs Are So Popular
- Striking red and black colouration
- More peaceful than many other barbs
- Active and engaging behaviour
- Great for planted aquariums
- Affordable and beginner-friendly
When kept correctly, Black Ruby Barbs are colourful, lively fish that bring movement and contrast to a community tank.
Frequently Asked Questions
They are generally peaceful but can nip fins if kept in small groups.
At least 6, though larger groups are recommended.
Yes, males develop deeper red colouration as they mature and during breeding.
At least 75 litres, with more space preferred for larger groups.
Looking to Buy or Sell Black Ruby Barbs 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.