Sphaeramia orbicularis

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Facts
Latin name Sphaeramia orbicularis - (Cuvier, 1828)
Local name Orbiculate cardinalfish
Family Apogonidae - Sphaeramia
Origin East Indian Ocean, West Indian Ocean, Australia, Japan, The Red Sea, Indonesia, Central/West Pacific
Max length 10 cm (3,9")
As aquarium fish
Minimum volume 100 cm (26 gal)
Hardiness Hardy
Suitable for aquarium Suitable for most aquarium
Reef safe Reef safe with caution
Aggressiveness Docile
Feed
Recommended Zooplankton (Cyclops, pods...)
Small crustaceans (Krill, mysis, artemia...)
Mostly Larger crustaceans (Shrimp, crabs...)
Beware of
Can be a threat to small fish

This spicies might be a threat to smaller fishes.

Can be a threat towards small crustaceans

This species can be a threat towards small crustaceans, e.g. small shrimp.

Small aquaria

This species can be kept in a small tank, if it is specifically equipped to meet its needs.

It is recommended however, to keep it in an aquarium which is larger then described above.

Keep in mind
Groups

This species ought to be kept in a group of at least three.

Mouth incubating

The male incubates the eggs in its mouth.

Hiding places

This species needs good hiding places, for example, between live rocks.

Docile

This species is very shy and docile, so one should be careful when keeping it with more aggressive fish.

Bred in captivity

This species can be bred in captivity, one can therefore consider asking your local fish store for a captive bred specimen.

Descriptions and further reading
Family description (Apogonidae)

Cardinalfish come in many different shapes and colours, generally they are well suited for aquaria.

Cardinalfish have a large mouth and a big appetite, take this into account with feeding  the other fish. These fish typically live off of Artemia, Mysis and krill. In the aquarium they will eat anything they can.

They will sometimes eat small shrimps and fish, so do be aware of this, but it is not normally a problem.

It is possible to keep several species together, if space allows. Some species will form  small shoals. They are normally peaceful towards other fish, but will sometimes fight among themselves if there isn't sufficient space or food.

Many species are nocturnal and will therefore often seek a hiding place during the day. This can be between stones, SPS corals and, in some cases, in an anemone and between spines of Sea urchins.

Cardinalfish are a good choice if ones wishes to attempt to start a breeding tank.

FishBase
Distribution Indo-Pacific: East Africa to Kiribati, north to the Ryukyu Islands, south to New Caledonia; Belau to eastern Caroline and Mariana Islands in Micronesia.
English common names Orbiculate cardinalfish
Polka-dot cardinalfish
References and further reading

About references

Scott W. Michael. 2001. Basslets, Dottybacks & Hawkfishes: v. 2 (Reef Fishes) - TFH Publications / Microcosm Ltd. - (English)
Bob Fenner. Cardinalfishes, Family Apogonidae, Pt. 1Pt. 2 - Wet Web Media - (English)