Cubicus Boxfish
Ostracion Cubicus
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Suggested Tank
180+ gallons
Max Size
18 inches
Difficulty
Temperament
Description
A rigid, cube-shaped fish whose juveniles are brilliant yellow covered in black polka dots, fading to dull yellow-brown or bluish-grey with pale spots as adults; it grows far larger than most buyers expect, reaching up to about 18 inches. Slow, hovering swimmers with engaging personalities, they are non-aggressive but will nip corals, clams, and small invertebrates, and their skin secretes pahutoxin when stressed, which can wipe out an entire aquarium. Keep one per system in a very large, low-current tank with peaceful tankmates, generous live rock for grazing, oversized skimming, and carbon on hand for toxin emergencies.
Reef Safe
No
Environment
The Cubicus Boxfish needs a large tank with plenty of hiding spots. It requires good water quality and a stable environment.
Behavior
This fish is known for its peaceful nature and slow-moving behavior. It is not a good swimmer and prefers to hover in the water. The Cubicus Boxfish is known to release toxins when stressed or threatened.
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Cubicus Boxfish
Ostracion Cubicus
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