Celestial eye goldfish

Overview

The celestial eye goldfish (Carassius auratus) is a distinctive dorsal-less fancy whose eyes are permanently turned upward toward the sky — hence the name. It reaches 13–18 cm and lives 10–15 years. That fixed upward gaze means it can barely see forward or downward, so the celestial is a slow, vulnerable fish that struggles to find food and avoid hazards. It needs the same protective, hazard-free care as its close relative the bubble eye.

Tank & water

Give one celestial 75 litres (20 gallons), plus about 40 litres per extra fish. Priorities:

• No heater, stable warmth: celestials are cold-water fish that prefer a steady 18–23 °C as a sensitive fancy.
• Smooth, safe décor: rounded ornaments and soft plants only — their poor sight means they bump into things.
• Gentle flow: temper the external filter outflow, as these weak swimmers tire in current.

Feeding

Celestials are omnivores whose upward sight makes feeding the central challenge. Use a quality sinking goldfish food and allow plenty of time for them to find it, supplementing with blanched peas and soft vegetables. Sinking food also limits the air-gulping that causes swim-bladder issues in dorsal-less fancies. Feed small amounts once or twice daily and keep water clean with regular maintenance and water testing.

Tankmates

Keep celestials only with the slowest, gentlest fancy goldfish — bubble eyes, ranchu, lionheads and other calm dorsal-less types. Faster fancies, single-tailed goldfish like comets and any nippy species will out-compete them badly, so keep the tank slow and peaceful. They are not tropical community fish. A small group of equally delicate fancies is ideal — plan numbers with how many fish in an aquarium.

Like the bubble eye, the celestial is best regarded as a fish for a patient keeper who is happy to build the whole tank around its limitations. A dedicated, hazard-free tank with only celestials in it is arguably the ideal, since it removes any competition and any risk from faster fish entirely. Manage it that way and this strange, upward-gazing goldfish is a hardy and long-lived companion that thrives on the calm, careful routine it demands.