Here's why:
* Optimal Temperature: The ideal water temperature for goldfish is between 68-72 degrees Fahrenheit. This is the range where they are most comfortable and thrive.
* Temperature Tolerance: Goldfish can tolerate temperatures slightly above and below their ideal range. However, prolonged exposure to temperatures outside this range can lead to health problems.
* Stress: Water at 64 degrees Fahrenheit can be stressful for goldfish. It may cause them to be less active, eat less, and be more susceptible to diseases.
Important Considerations:
* Acclimation: If you need to change the temperature of your goldfish's water, do it gradually over several hours to avoid shocking them.
* Other Factors: Water quality, diet, and tank size all play a role in goldfish health.
* Cold Water Species: Some types of goldfish, like Comet Goldfish, are more tolerant of cooler water.
In summary: While 64 degrees Fahrenheit isn't deadly for goldfish, it's not the best temperature for their long-term health. Aim for temperatures closer to their ideal range of 68-72 degrees for a happy and healthy goldfish.