Here's why:
* Temperature Sensitivity: Tropical fish are adapted to warm water temperatures, typically between 75°F and 82°F (24°C to 28°C). They have specific metabolic and physiological processes that are optimized for these temperatures.
* Metabolic Slowdown: As water temperature drops, their metabolism slows down significantly, making it difficult for them to process food, absorb oxygen, and maintain their bodily functions.
* Immune Suppression: Cold water weakens their immune system, making them more susceptible to diseases and infections.
* Organ Damage: Prolonged exposure to cold water can damage their organs, particularly their gills.
What to Do:
* Maintain Proper Temperature: Invest in a reliable aquarium heater and thermostat to keep the water temperature within the recommended range for your specific fish species.
* Gradual Acclimation: If you need to change the water temperature (for example, during a water change), do it gradually over a few hours.
* Avoid Drafts: Keep your aquarium away from cold drafts or windows.
In Summary:
Cold water is a serious threat to tropical fish. Always make sure the water temperature is appropriate for their needs to keep them healthy and happy.