Goldfish
The goldfish ("Carassius auratus") is a freshwater fish in the family Cyprinidae of order Cypriniformes. It is one of the most commonly kept aquarium fish.
Lionhead (goldfish)
Lionheads are sometimes sensitive to low water temperatures. Due to their slow nature, they should not be kept with faster moving fish such as comets, common goldfish, and shubunkins. If kept in an aquarium, the recommended tank size for one fish is 20 gallons with double filtration. They are social fish so tank mates are recommended. They should be kept in a species-only tank with other goldfish. It is advised to feed goldfish only sinking food because flakes can cause swim bladder issues. Lionhead goldfish are omnivores so they thrive on a diet rich in plant and animal matter. High-protein diets will make their colors more vibrant and will cause greater growth.