Description
Scientific Name: Carassius auratus
Common Name: Red Cap Goldfish
Adult Size: 6 to 8 inches (15–20 cm) in home aquariums (can grow larger in ponds)
Life Expectancy: 10 to 15 years on average, up to 20+ years with excellent care
Habitat: Originally from slow-moving freshwater bodies in East Asia.
Modern fantails are captive-bred and thrive in cold or temperate freshwater aquariums or ponds.
Tank Requirements
Minimum Tank Size: 20 gallons for one, +10 gallons for each additional fish
Ideal Temperature: 65–75°F (18–24°C) – can tolerate slightly cooler water
pH Range: 6.5–7.5
Water Hardness: 5–19 dGH
Temperament: Peaceful, Social
Best kept with other fancy goldfish varieties
Avoid fin-nipping tankmates or fast/aggressive fish
Diet & Nutrition
Omnivorous – Should have a balanced diet including:
High-quality goldfish pellets or flakes
Blanched vegetables: peas (deshelled), spinach, zucchini
Occasional live/frozen foods like brine shrimp, bloodworms
