Angelfish are prone to death in water temperatures below 14 degrees Celsius. Angelfish are tropical fish and have a relatively wide suitable water temperature range. Generally, they can survive between 14 and 31 degrees Celsius. However, when the water temperature is below 14 degrees, they are likely to suffer from diseases such as enteritis, fin - clamping, and white spot disease, and may even die. The most suitable water temperature range is 24 - 28 degrees Celsius. Within this range, angelfish are in the best condition for growth and health. If the water temperature is below 18 degrees, the resistance of angelfish will decline, and they are even more likely to die when the temperature drops below 15 degrees.
To ensure the health of angelfish, it is recommended to keep the water temperature between 24 and 28 degrees Celsius and use a heating rod to maintain a constant water temperature, especially in winter or when the air temperature is low. In addition, when changing the water, make sure the temperature difference does not exceed 4 degrees to prevent angelfish from getting sick due to a temperature shock.