Species profile
Brilliant Rasbora
Rasbora borapetensis
Peaceful
Easy care
80 L minimum aquarium
4–5 cm adult size
Mid–top
Minimum group: 8
About this species
General notes for hobby use.
Active Southeast Asian rasbora also known as Blackline or Red-tailed Rasbora. Peaceful, hardy and best in a substantial shoal.
Water parameters
Suggested general range for long-term care.
Temperature
22–28 °C
pH
6–7.5
GH
Not yet documented
KH
Not yet documented
Flow preference
Moderate
Data confidence
Verified
Behaviour
General behaviour traits used by TanksConnected compatibility checks.
Minimum group size
Minimum group: 8
Tank zone
Mid–top
Territory level
Low
Predation risk
Shrimp fry
Bioload factor
0.7
Peaceful active shoaler. Keep a larger group with open swimming space; compatible with similarly active peaceful fish.
Compatibility flags
Quick cautions for common tank-planning issues.
Fin nipper
No
Plant safe
Yes
Shrimp safe
No / caution
Snail safe
Yes
Cave breeder
No
Digs substrate
No
Jump risk
Low
Natural history & care
Research-backed context for long-term aquarium care.
Lifespan
Not yet documented
Diet type
Omnivore
Minimum aquarium volume
80 L
Minimum footprint
80 × 35 cm
Accepted scientific name
Rasbora borapetensis
Alternative names
Brilliant Rasbora, Blackline Rasbora, Red-tailed Rasbora, Redtail Rasbora
Native range
Mekong, Chao Phraya and Mae Klong drainages and parts of the northern Malay Peninsula.
Natural habitat
Shallow ponds, ditches, canals, reservoir margins and medium-to-large river systems. Provide open mid/upper swimming space with planted margins.
Diet & feeding
Small omnivore/invertivore; feed quality fine dry foods with frozen/live insects and crustaceans.
Breeding & sexing
Research-backed guidance for identifying sexes and reproductive behaviour.
Sexing
Sexes are similar; mature females are usually slightly larger and fuller-bodied.
Breeding
Free-spawning egg scatterer among fine aquatic plants with no parental care.