Calico Fantail Goldfish

Calico Fantail Goldfish (Carassius auratus) combines the classic egg-shaped body and flowing double fan-tail of the Fantail with the extraordinary multi-color calico pattern — blue-violet, red, orange, black, and white in irregular patches across the body. The nacreous scaling that produces the blue element in calico goldfish creates a depth and complexity of color that metallic-scaled fish simply cannot achieve.

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 calico pattern results from nacreous scaling — a combination of metallic and transparent scale elements that allows multiple layers of pigment to show simultaneously. The blue-violet tones visible in good calico fish are produced by dark chromatophores showing through the transparent scale areas. No two calico Fantails are identically patterned.

Keep in groups of two or more. One of the most visually complex fancy goldfish available — the layered color pattern shifts with light angle and continues to develop throughout the fish's life. 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