Ostorhinchus cookii

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Facts
Latin name Ostorhinchus cookii - (Macleay, 1881)
Local name Cooks cardinalfish
Family Apogonidae - Ostorhinchus
Origin East Indian Ocean, West Indian Ocean, Australia, Japan, The Red Sea, Indonesia, East Pacific, New Zealand, Central/West Pacific
Max length 10 cm (3.9")
As aquarium fish
Minimum volume 150 l (40 gal)
Hardiness Hardy
Suitable for aquarium Suitable for most aquarium
Reef safe Always reef safe
Aggressiveness Peaceful
Feed
Recommended Small crustaceans (Krill, mysis, artemia...)
Zooplankton (Cyclops, pods...)
Maybee Fish
Larger crustaceans (Shrimp, crabs...)
Beware of
Can be a threat to small fish

This spicies might be a threat to smaller fishes.

Threat towards crustaceans

This species poses a threat towards shrimps and crabs etc., which are relatively small.

Keep in mind
Hiding places

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

Nocturnal

This species is nocturnal and therefore the most active when the light is dimmed or turned off.

Formerly classified as Apogon

Species are sometimes reclassified. This species was formerly classified as a member of the Apogon genus.

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: Red Sea and the Gulf of Oman south to Natal and east to the western Pacific where it ranges from Japan to the Great Barrier Reef and New Caledonia. Recently reported from Tonga (Ref. 53797).
English common names Cook's cardinalfish
Cook's soldierfish
Multilined 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)