Compatibility
Common Molly × Harlequin rasbora Compatibility
Compatibility calculated based on predation risk, behaviour profile, and water-parameter overlap.
Common Molly and Harlequin rasbora can live together in a well-planted community tank, but size difference should be monitored and water-parameter overlap should be checked carefully.
TemperatureA
pHC
HardnessB
FlowA
PredationB
BehaviourA
Compatible with cautionB
Envrionmental Factors
Temperature overlap
Common Molly: 18.0–28.0 °C
Harlequin rasbora: 22.0–26.0 °C
Shared window: 22.0–26.0°C.
pH overlap
Common Molly: 7.5–8.5
Harlequin rasbora: 5.0–7.2
No shared operating range is present between the recorded values.
Hardness overlap
Common Molly: Medium → Hard
Harlequin rasbora: Very soft → Medium
Shared hardness bands: 1 (overlap ratio 50%).
Flow match
Common Molly: Medium
Harlequin rasbora: Low
Flow preferences do not conflict directly (no low-vs-high clash).
Behavioural Factors
Predation risk (size ratio)
Adult size ratio: 2.00x
Size gap is between 2.0x and 3.0x, so monitor for dominance and mouth-fit risk.
Behaviour risk
- - Both species are generally peaceful; behaviour conflict risk is low.
Parameter snapshot
| Parameter | Common Molly | Harlequin rasbora |
|---|---|---|
| Adult size | 10.0 cm | 5.0 cm |
| Temperature | 18.0–28.0 °C | 22.0–26.0 °C |
| pH | 7.5–8.5 | 5.0–7.2 |
| Hardness | Medium → Hard | Very soft → Medium |
| Flow | Medium | Low |
| Locations | Mexico, South America | Indonesia |
Geographic overlap (supporting signal)
No recorded overlap in our dataset.
Best tank mates for Common Molly
Reference links to curated compatibility pair pages for this species.
Cherry barb
Rohanella titteya
Guppy
Poecilia reticulata
Platy
Xiphophorus maculatus
Swordtail
Xiphophorus hellerii
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