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Carassius auratus, commonly known as goldfish, are among the most popular freshwater fish species in the aquarium trade. Here is some key information about these popular fish:

1. Temperature: Goldfish are relatively tolerant when it comes to water temperature, but they generally thrive in the range of 18 to 23 degrees Celsius. It is essential to maintain a stable temperature for their well-being.

2. pH: Goldfish want a neutral to slightly alkaline pH, ideally between 7.0 and 7.5. It is important to monitor water pH regularly to ensure a healthy environment.

3. Water hardness: They adapt well to a wide range of water hardnesses, but a total hardness (GH) between 5 and 20 is generally recommended for their optimal health.

4. Behavior: Goldfish are known for their active and social behavior. They can be kept in groups, but it is important to ensure that the aquarium provides enough space to avoid stress. These fish are curious and can interact with their environment.

5. Environment: A spacious aquarium is essential for goldfish due to their potential size. A minimum of 150 liters per fish is recommended. Be sure to include sturdy plants and hiding places, as they want to explore their habitat. Since they can have a lot of waste, a good filtration system is necessary to maintain water quality.

Carassius auratus make fascinating aquatic companions and can live for many years with proper care. It is important to closely monitor water parameters, provide a balanced diet and have an environment that meets their natural needs for a healthy and fulfilling life.