Ostracion cubicus

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Facts
Latin name Ostracion cubicus - Linnaeus, 1758
Local name Yellow boxfish
Family Ostraciidae - Ostracion
Origin East Indian Ocean, West Indian Ocean, Australia, The Red Sea, Indonesia, East Pacific, Central/West Pacific
Max length 45 cm (17,7")
As aquarium fish
Minimum volume 800 cm (211 gal)
Hardiness Delicate
Suitable for aquarium Experience, preparation and extra care required
Reef safe Not reef safe
Aggressiveness Unknown
Feed
Recommended Macroalgea (Eg. seaweed / nori)
Small crustaceans (Krill, mysis, artemia...)
Mostly Other invertebrates
Soft coral
Large polyp stone coral (LPS)
Maybee Larger crustaceans (Shrimp, crabs...)
Beware of
Eats tubeworms

This species likes to eat tubeworms.

Can be a threat towards crustaceans etc.

This species will eat shrimps, crabs, small bivalves, snails and the like.

Poisonous skin

This species has a toxin in its skin, which it releases when highly stressed or dying.

This poison can kill all the aquatic life in the aquarium, if unlucky.

Demand a very large aquarium when fully grown

This species needs a very large aquarium when fully grown.

Exactly how big the aquarium should be is hard to say, but the size of this species is such, that it cannot normally be kept in a home aquarium.

Keep in mind
Live food

There is a greater chance of success with this species if one can supply a living feed to allow it to adapt to the tank.

Poor maneuverability

This species cannot maneuver in strong currents, especially so when small.

Pay particular attention to the pump’s water inlet as these fish in certain circumstances, can get stuck.

Personality

This species often has a fun and interesting personality.

Descriptions and further reading
Family description (Ostraciidae)

Boxfish(Ostraciidae) have a unique square shape and a particular way of swimming.
They have a rather special personality, which one quickly comes to love.

Boxfish live typically off a mixture of algae, coral polyps, zooplankton, and in some cases crustaceans.
They are not normally reef safe and when small will require gentle water circulation.

Boxfish can secrete a poison when stressed or if they die, which can in the worst case, kill the contents of a whole aquarium.
Never use the water the fish was transported in.

FishBase
Aquarium trade Yes
Distribution Indo-Pacific: Red Sea and East Africa (Ref. 3141) to the Hawaiian and Tuamoto islands, north to Ryukyu Islands, south to Lord Howe Island. The Red Sea population differs slightly in coloration and has been known as <i>Ostracion argus</i>; closely relate
English common names Spotted box fish
Yellow boxfish
Cube trunkfish
Black-spotted boxfish
Boxfish
French common names Bourse coffre
Poisson coffre jaune
Poulet de la mer
Danish common names Plettet kuffertfisk
References and further reading

About references

Bob Fenner. The Puffers Called Box-, Cowfishes, family Ostraciidae - Wet Web Media - (English)
Richard Aspinall. 2012. Oddballs for the Marine Aquarium - Tropical Fish Hobbyist - (English)