Also known as: Yellow Boxfish

The Ostracion cubicus grows up to 18 inches.  The small size will come to you generally 1 to 2 inches; the medium generally 2 to 3 inches; the large generally 3 to 5 inches.  The Cubicus Boxfish prefers a tank of at least 150 gallons with plenty of places to hide & swim.  The Ostracion cubicus is a omnivore and likes to eat variety of chopped foods (meats & veggies), bloodworms or live Mysis Shrimp.  The Cubicus Boxfish is a high maintenance fish.  The Cubicus Boxfish may act semi-aggressively toward other fish. It is a venomous fish, ostracitoxin. Warning signs include stress and concavity in the side walls.  Difficult to keep in capitivity  Keep water quality high (SG 1.020 - 1.025, pH 8.1 - 8.4, Temp. 72 - 78° F).  , Indo-Pacific, Red Sea and East Afica to the Hawaiian and Tuamotu islands.  Difficult to keep in capitivity. Ostracion cubicus, Linnaeus 1758, the Yellow Boxfish. The Cubicus fish is popular with most Aquarists, however this fish has been implicated directly in tank wipeouts from its passing on in the aquarium. It is however, relatively hardy and will adapt quite well to the community aquarium quite nicely. Should one of these fish pass on in the aquarium, remove the specimen immediately. It is then highly recommended to do a 50% water change, and introduce a bag of activated carbon into the filtration, to help absorb any possible contamination. The Cubicus should not be kept with aggressive or fast moving fishes and their skin can be damaged by the actions of cleaner fish. Cubicus should not be kept with other Cubicus or other Boxfish, as they can be territorial.

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