Here are some general ranges:
* Tropical fish: 78-82°F (25-28°C)
* Coldwater fish: 60-72°F (15-22°C)
* Temperate fish: 68-78°F (20-25°C)
Factors that influence optimal temperature:
* Species: Different fish species have different temperature requirements.
* Origin: Fish from tropical climates need warmer water, while those from colder regions need cooler water.
* Season: Some fish may tolerate slightly higher or lower temperatures depending on the season.
* Water chemistry: Water temperature can affect the levels of dissolved oxygen and other chemicals in the water.
Important points:
* Choose a heater: For tropical and temperate fish, a heater is essential to maintain a stable temperature.
* Check the heater's settings: Make sure the heater is set to the correct temperature for your fish.
* Monitor water temperature regularly: Use a thermometer to check the water temperature daily.
* Avoid sudden temperature changes: Rapid changes in temperature can stress and even kill fish.
Before you set up your aquarium, research the specific temperature needs of the fish you plan to keep.
Remember, maintaining the correct temperature is crucial for the health and well-being of your fish.