Molly Temperature: Ideal Water Temp
Ideal: 72-82°F (22-28°C)
The Molly is a tropical species. Aim for the middle of its range, around 77°F, and keep it steady — sudden swings stress fish more than a stable temperature.
You will need a heater to hold 72°F and up in most rooms — use roughly 3-5 watts per gallon plus a separate thermometer.
| Fahrenheit | 72-82°F |
|---|---|
| Celsius | 22-28°C |
| Sweet spot | ~77°F |
Frequently asked questions
What temperature do Molly like?
72-82°F (22-28°C), ideally around 77°F.
Does a Molly need a heater?
Yes — to reliably hold 72°F+ you need a heater in most homes.
More on this species: Molly full care guide · tank size · temperature · pH & hardness · tank mates