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Gold Belly Cardinal (Sphaeramia orbicularis (Gold-belly/Orbiculate Cardinalfish))

Gold Belly Cardinal

Sphaeramia orbicularis (Gold-belly/Orbiculate Cardinalfish)
Family
Cardinalfish / Apogonidae
Care level
Beginner
Temperament
Peaceful
Reef safe
Reef safe
Max size
8 cm
Min tank
150 L · 40 gal
Origin
Indo-Pacific
Diet
Carnivore
Food
Mysis, Brine shrimp, Marine pellets, Frozen carnivore blends

Overview

The Gold Belly Cardinal is a rounded, gently patterned fish with a pale body, dark vertical banding, and a warm golden wash across the lower body, popular for its calm nature and slow, hovering swimming style. It's a hardy, easygoing species well suited to nano and medium reef tanks.

Like other cardinalfish it's a mouthbrooder, and in a stable, well-fed tank a pair may spawn, with the male carrying fertilised eggs in his mouth for around a week before releasing free-swimming fry.

Its undemanding care requirements and peaceful temperament make it a solid choice for keepers wanting an easy, attractive addition that won't disrupt a calm community reef.

Compatibility

Gold Belly Cardinals are entirely peaceful and reef safe, ignoring corals, clams, and invertebrates. They do best with other calm tankmates, since more boisterous or fast-swimming fish can outcompete them for food or stress them with constant activity.

They can be kept in pairs or small groups in a large enough tank, generally showing little aggression toward their own kind compared to many other reef fish.

Health & quarantine

This is a hardy, adaptable species with few chronic health issues, generally acclimating and feeding well without major complications. A standard quarantine period of two to four weeks is recommended good practice, and this species tends to ship and settle in with minimal stress compared to more delicate reef fish.

Frequently asked questions

Is the Gold Belly Cardinal reef safe?
Yes, fully reef safe with corals and invertebrates.
Can I keep multiple Gold Belly Cardinals together?
Yes, they can be kept in pairs or small groups in a large enough tank, showing little aggression toward their own kind.
Will Gold Belly Cardinals breed in my tank?
Possibly — they're mouthbrooders, and a stable, well-fed pair may spawn, with the male carrying the eggs in his mouth.
Is the Gold Belly Cardinal a good beginner fish?
Yes, it's hardy, peaceful, and easy to feed, making it a solid choice for new reef keepers.
What tank size suits a Gold Belly Cardinal?
150 litres is a reasonable minimum given its small, calm nature.

Care guidance is drawn from our own experience — every fish is an individual, so treat it as a starting point, not a guarantee. Not sure if a species suits your tank? Come ask us in store. New to the terms? Read the care-terms glossary.