Red Cap Oranda Aquarium Fish - Dimension (L*w*h): Varies

Red Cap Oranda Aquarium Fish Specifications & Care Guide

Scientific Name: Carassius auratus (fancy goldfish)
Common Names: Red Cap Oranda, Redcap Oranda Goldfish
Type: Freshwater aquarium fish (fancy goldfish variety)

Appearance

Bright snow-white body with a distinctive red "cap (wen) on the head.

Rounded, deep body and long, flowing double tail fin.

The wen is a fleshy head growth that begins forming at 34 months and develops fully in 23 years.

Size & Lifespan

Adult Size: Typically 1525 cm (610 in) total length, including fins; some individuals can reach up to 30 cm (12 in) with excellent care.

Lifespan: Generally 1020 years with proper care and good water quality.

Tank & Water Requirements

Tank Size:

Minimum 75 litres (20 gal) for one fish, but larger is strongly recommended (e.g., 100+ L / 30+ gal) as they grow and produce a lot of waste.

Water Parameters:

Temperature: 1824 C (6575 F) cool water is preferred; avoid tropical heat.

pH: 6.08.0 (stable pH is more important than a precise number).

Hardness: 519 dGH.

Filtration & Cleaning:

Goldfish are high waste producers strong filtration + regular water changes are essential.

Low to moderate water flow preferred (strong currents stress fancy goldfish).

Diet

Omnivorous: high-quality sinking pellets or goldfish flakes as staple.

Supplement with frozen/live foods (e.g., brine shrimp, bloodworms) and blanched vegetables (peas, spinach).

Sinking foods help avoid gulping air and reduce swim-bladder issues common to fancy goldfish.

Temperament & Tankmates

Temperament: Peaceful and slowmoving.

Best kept with other fancy goldfish of similar size and care needs.

Avoid fast, aggressive, or very small tankmates (e.g., tiny shrimp/snails) that may be eaten or stressed.

Notes & Tips

The wen (head growth) can be prone to injury and bacterial infection if water quality is poor or the dcor is sharp.

Avoid sharp rocks and decorations; use smooth surfaces and wide open swimming space.

Weekly partial water changes (2530%) help maintain healthy parameters.

Quick Reference Table
FeatureSpecification
Scientific NameCarassius auratus
Maximum Size1525 cm (610 in)
Lifespan1020 years
Temp.1824 C (6575 F)
pH6.08.0
Tank Size75 L / 20 gal (bigger better)
DietOmnivore (pellets, veggies, live/frozen)
TemperamentPeaceful