Compatibility
Common Molly × Swordtail Compatibility
Compatibility calculated based on predation risk, behaviour profile, and water-parameter overlap.
Common Molly and Swordtail can usually live together in a well-planted community tank.
TemperatureB
pHB
HardnessA
FlowA
PredationA
BehaviourA
Data coverage note: 1 key check marked unknown.
Generally compatibleA
Envrionmental Factors
Temperature overlap
Common Molly: 18.0–28.0 °C
Swordtail: -
One or both species are missing range data for this check.
pH overlap
Common Molly: 7.5–8.5
Swordtail: 7.0–8.0
Shared window: 7.5–8.0.
Hardness overlap
Common Molly: Medium → Hard
Swordtail: Medium → Hard
Shared hardness bands: 2 (overlap ratio 100%).
Flow match
Common Molly: Medium
Swordtail: Medium
Flow preferences do not conflict directly (no low-vs-high clash).
Behavioural Factors
Predation risk (size ratio)
Adult size ratio: 1.40x
Adult size gap is under 2.0x, which is usually a safer ratio.
Behaviour risk
- - Both species are generally peaceful; behaviour conflict risk is low.
Parameter snapshot
| Parameter | Common Molly | Swordtail |
|---|---|---|
| Adult size | 10.0 cm | 14.0 cm |
| Temperature | 18.0–28.0 °C | - |
| pH | 7.5–8.5 | 7.0–8.0 |
| Hardness | Medium → Hard | Medium → Hard |
| Flow | Medium | Medium |
| Locations | Mexico, South America | Central America |
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
Best tank mates for Swordtail
Reference links to curated compatibility pair pages for this species.
Guppy
Poecilia reticulata
Platy
Xiphophorus maculatus