Goldfish Tanks: How to Set up, Sizes, & Tank Mates.The perfect tank size for two or more common goldfish is 40 gallons, plus another 12 gallons for every extra fish 52 gallons for three common goldfish, for example. Equipment Needed to Set up a Goldfish Tank.
Tank Mates. Ranchu goldfish are perfect for multi-species tanks, but you must be mindful of how others might affect the fishs well-being. Theyre not aggressive, but they will be the target of fish species that are!
Small tank mates often become accidental meals. Size compatibility is critical: companions must be too large to swallow yet calm enough not to bully the goldfish.

Fish tank (minimum size 20 gallons). Aquarium vacuum.Q: Can Oranda goldfish live with other fish? A: Yes, there are several coldwater fish species that make good tank mates for Orandas, including loaches, Plecos, and Platies.
Betta fish tank mates, Tropical fish tanks, Fish tank.Goldfish must be kept in a fish tank or aquarium with proper filtration and aeration, and require consistent cleaning and main |

Lionhead Goldfish tank size and setup. Lionhead Goldfish requires a minimum of 30 gallons for healthy adults. The minimum is based on the species' adult size (7 inches), territorial range, and behavior pattern.
For fancy goldfish, the safest tank mates are other fancy goldfish of similar size, Dojo Loaches, Hillstream Loaches, and White Cloud Mountain Minnows. Avoid anything nippy or overly energetic.
The short answer is yes, goldfish can have tank mates, but its not as simple as throwing any fish into the same aquarium. Careful consideration must be given to several factors, including temperature compatibility, tank size, temperament, and bioload.