Compatibility
Betta × Harlequin rasbora Compatibility
Compatibility calculated based on predation risk, behaviour profile, and water-parameter overlap.
Betta and Harlequin rasbora can live together in a well-planted community tank, but territorial behaviour should be monitored.
TemperatureB
pHA
HardnessA
FlowA
PredationA
BehaviourB
Compatible with cautionB
Envrionmental Factors
Temperature overlap
Betta: 24.0–30.0 °C
Harlequin rasbora: 22.0–26.0 °C
Shared window: 24.0–26.0°C.
pH overlap
Betta: 6.0–7.5
Harlequin rasbora: 5.0–7.2
Shared window: 6.0–7.2.
Hardness overlap
Betta: Very soft → Medium
Harlequin rasbora: Very soft → Medium
Shared hardness bands: 3 (overlap ratio 100%).
Flow match
Betta: Low
Harlequin rasbora: Low
Flow preferences do not conflict directly (no low-vs-high clash).
Behavioural Factors
Predation risk (size ratio)
Adult size ratio: 1.20x
Adult size gap is under 2.0x, which is usually a safer ratio.
Behaviour risk
- - Betta: Territorial.
- - At least one species can be pushy or fin-nippy; monitor closely.
- - Behaviour may vary by tank size and stocking; have a backup plan.
Parameter snapshot
| Parameter | Betta | Harlequin rasbora |
|---|---|---|
| Adult size | 6.0 cm | 5.0 cm |
| Temperature | 24.0–30.0 °C | 22.0–26.0 °C |
| pH | 6.0–7.5 | 5.0–7.2 |
| Hardness | Very soft → Medium | Very soft → Medium |
| Flow | Low | Low |
| Locations | Cambodia, Thailand | Indonesia |
Geographic overlap (supporting signal)
No recorded overlap in our dataset.
Best tank mates for Harlequin rasbora
Reference links to curated compatibility pair pages for this species.
Cardinal Tetra
Paracheirodon axelrodi
Chili Rasbora
Boraras brigittae
Corydoras
Corydoras spp.
Dwarf Rasbora
Boraras maculatus