Description
Goldfish (Carassius auratus) are closely related to koi (Cyprinus rubrofuscus) and common carp (Cyprinus carpio), which could be misidentified as goldfish. The typical length of a goldfish is between 5-8 inches, but they can reach close to 2 feet long. They can weigh up to 6 pounds (USGS).
What Size Tank Do Fancy Goldfish Need? Appropriate aquarium size can be a point of contention among goldfish owners, but in general, we recommend 20 gallons of water volume per goldfish, with at least 10 gallons added for every other goldfish.
Temperature Range: 18-25°C. pH Range: 6.0-8.0, though 7.5 is ideal. Compatibility: Peaceful, though best suited to species-only aquariums. Area Of Origin: China.
