Fantail Fancy Goldfish

Fantail Fancy Goldfish (Carassius auratus) is the original and most fundamental fancy goldfish variety — the foundation from which virtually all other fancy goldfish were developed. The egg-shaped body, pointed head, and distinctive fan-shaped double tail that splits into four lobes when spread are the defining features. Available in virtually every goldfish color and pattern, the Fantail is the ideal introduction to fancy goldfish keeping.

Feeding & Care Tip: Hikari Fancy Goldfish slow-sinking pellets are the ideal staple for fancy goldfish — the slow sink rate gives these slower-swimming varieties time to feed without gulping air at the surface, which can cause swim bladder problems. Sera Goldy Color Spirulina enhances red and orange coloration. Supplement 2–3× per week with Hikari Frozen or Freeze-Dried Baby Brine Shrimp or Hikari Frozen Daphnia. If keeping alongside slim-bodied goldfish, offer Hikari Goldfish floating pellets at the same time — the slim-bodied fish will take the floating food while the fancies feed at their preferred mid-water level, ensuring both types eat well.

The Fantail is believed to have originated in China or Japan and is one of the oldest documented fancy goldfish varieties. Its double tail — produced by a genetic mutation affecting tail fin development — was the foundation mutation from which all other double-tailed fancy varieties descend. The Fantail is one of the hardiest fancy goldfish, more robust than most egg-bodied varieties due to its less extreme body shape.

Keep in groups of two or more. One of the best fancy goldfish for beginners — the Fantail's relatively robust constitution, good swimming ability, and wide availability make it ideal for aquarists new to fancy goldfish. Compatible with other fancy goldfish varieties. Fancy goldfish require a larger aquarium than most people expect — a minimum of 20 gallons for a single fish, with an additional 10 gallons per additional fish. A long, wide tank is preferable to a tall, narrow one — fancy goldfish spend most of their time in the lower half of the water column and benefit more from bottom area than height. Gentle filtration that moves the water without creating strong currents is ideal — the egg-shaped body of fancy goldfish makes them poor swimmers in turbulent water.

Goldfish are among the longest-lived aquarium fish — well-kept fancy goldfish regularly reach 10–15 years with excellent care. The investment in appropriate tank size, good filtration, and regular water changes is rewarded with a fish that becomes a genuine long-term companion. Filtration & Water Quality: Goldfish are high-waste fish that require robust filtration — significantly more than most tropical fish of equivalent size. A filter rated for at least twice the tank volume is recommended. Regular partial water changes of 25–30% weekly are essential. Despite their reputation as 'easy' fish, goldfish kept in under-filtered or overcrowded conditions decline quickly. Good filtration is the single most important factor in keeping goldfish healthy and long-lived.

Care & Ideal Parameters