Black Ruby Barb

The Black Ruby Barb is a beautiful and relatively peaceful barb species native to Sri Lanka. It is known for its deep ruby-red coloration in males, especially during breeding, contrasted with dark vertical bands. Females are more subdued with golden-brown tones. Compared to other barbs, this species is calmer and better suited for community aquariums.  

Black Ruby Barb (Pethia nigrofasciata) – Complete Care Guide Description The Black Ruby Barb is a beautiful and relatively peaceful barb species native to Sri Lanka. It is known for its deep ruby-red coloration in males, especially during breeding, contrasted with dark vertical bands. Females are more subdued with golden-brown tones. Compared to other barbs, this species is calmer and better suited for community aquariums. Water Parameters Temperature: 23°C – 27°C pH: 6.0 – 7.0 Hardness: 2 – 12 dGH Tank Size: Minimum 20–30 gallons Water Type: Soft to slightly hard, clean and well-filtered They thrive best in slightly acidic, well-maintained water conditions. Care & Maintenance Black Ruby Barbs are hardy but prefer a natural setup: Keep in groups of at least 6–8 to reduce stress Provide a heavily planted tank with shaded areas Include driftwood and leaf litter for a natural feel Use gentle to moderate filtration Perform regular water changes (20–30% weekly) Dim lighting helps enhance their rich coloration. Behaviour & Temperament This species is peaceful to mildly active: Less aggressive than Tiger Barbs Occasional fin-nipping may occur but is rare in proper groups Social and schooling fish that feel secure in numbers Occupies mid-level swimming areas They are ideal for peaceful community aquariums. Suitable Tank Mates Best paired with peaceful and similarly sized fish: Tetras (Ember, Glowlight, Black Neon) Rasboras Corydoras Catfish Small loaches Other peaceful barbs These species help maintain a calm and balanced tank. Tank Mates to Avoid Avoid overly aggressive or very delicate species: Aggressive cichlids Large predatory fish Extremely timid or slow fish Very long-finned species (if nipping occurs) This prevents stress and compatibility issues. Pro Tips Maintain slightly acidic water to bring out best colors Keep in larger groups for natural behavior and reduced stress Use dark substrate and plants to enhance coloration Feed a varied diet (flakes, micro pellets, frozen/live foods) Provide shaded areas using floating plants Ideal for peaceful planted community aquariums The Black Ruby Barb is a vibrant yet gentle schooling fish that adds rich color and calm activity to planted tanks. With proper care and group size, it becomes a stunning highlight in peaceful freshwater aquariums.