A Detailed Guide to the Suitable Temperature Range for Guppies
I. Basic Suitable Temperature
Adult Guppies for Daily Rearing: The optimal temperature range is 22–26°C (71.6–78.8°F). Within this range, guppies maintain bright body colors and high energy levels.
Juvenile Guppies for Growth: Slightly higher temperatures are required. A range of 24–27°C (75.2–80.6°F) promotes healthy development, but temperatures exceeding 28°C (82.4°F) may cause deformities.
Breeding Period: A temperature of 26–28°C (78.8–82.4°F) stimulates breeding behavior in adult guppies and improves hatching rates. It is essential to keep temperature fluctuations ≤1°C (1.8°F).
II. Tolerance Limits and Risks
Survival Range: Guppies can adapt to temperatures between 16–34°C (60.8–93.2°F) for short periods. However, prolonged exposure to temperatures below 18°C (64.4°F) may lead to loss of appetite and increased susceptibility to diseases; temperatures above 30°C (86°F) will accelerate aging and cause oxygen deficiency.
Extreme Hazards: Temperatures below 15°C (59°F) can be fatal. In summer, when water temperatures exceed 32°C (89.6°F), take immediate cooling measures (e.g., moving the tank to an air-conditioned room or adding ice cubes slowly—ensure ice is not added directly to avoid sudden temperature drops).
III. Recommendations for Special Scenarios
Unheated Environments in Winter: In northern regions with central heating, indoor temperatures can naturally maintain 18–20°C (64.4–68°F) for guppy tanks. In southern regions without central heating, use a heater to control the water temperature within 22–26°C (71.6–78.8°F).
Variety Differences: Artificially bred guppy varieties (e.g., Platinum Guppies) are more sensitive to low temperatures. Priority should be given to temperature control for these varieties.
IV. Key Points for Temperature Management
Stability: Ensure the daily temperature fluctuation is ≤2°C (3.6°F), and the temperature difference between new water and tank water during water changes is ≤2°C (3.6°F).
Monitoring Tools: It is recommended to use a heater together with a thermometer for real-time temperature adjustment and monitoring.