Compatibility
Common Molly × Guppy Compatibility
Compatibility calculated based on predation risk, behaviour profile, and water-parameter overlap.
Common Molly and Guppy can usually live together in a well-planted community tank, but size difference should be monitored.
TemperatureA
pHB
HardnessA
FlowA
PredationB
BehaviourA
Generally compatibleA
Envrionmental Factors
Temperature overlap
Common Molly: 18.0–28.0 °C
Guppy: 20.0–28.0 °C
Shared window: 20.0–28.0°C.
pH overlap
Common Molly: 7.5–8.5
Guppy: 7.0–8.0
Shared window: 7.5–8.0.
Hardness overlap
Common Molly: Medium → Hard
Guppy: Medium → Very hard
Shared hardness bands: 2 (overlap ratio 100%).
Flow match
Common Molly: Medium
Guppy: Medium
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 | Guppy |
|---|---|---|
| Adult size | 10.0 cm | 5.0 cm |
| Temperature | 18.0–28.0 °C | 20.0–28.0 °C |
| pH | 7.5–8.5 | 7.0–8.0 |
| Hardness | Medium → Hard | Medium → Very hard |
| Flow | Medium | Medium |
| Locations | Mexico, South America | South America, Barbados |
Geographic overlap (supporting signal)
Shared: South America
Best tank mates for Common Molly
Reference links to curated compatibility pair pages for this species.
Cherry barb
Rohanella titteya
Platy
Xiphophorus maculatus
Swordtail
Xiphophorus hellerii
Best tank mates for Guppy
Reference links to curated compatibility pair pages for this species.
Endler's livebearer
Poecilia wingei
Platy
Xiphophorus maculatus
Swordtail
Xiphophorus hellerii