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Yellow Boxfish - Ostracion cubicus - Small/Medium

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This is a Restricted item and is not covered by our Arrive Alive 14-Day Guarantee.Please see our Guarantee Policy and Restricted Species List for more information.

The Yellow Boxfish (Ostracion cubicus) is one of the most common and popular boxfish available to aquarists. As juveniles, these boxfish are bright yellow with black spots. As they mature, the yellow becomes brownish and the spots fade.

Boxfish, Cowfish and Trunkfish are all very closely related to each other. All have bodies that are box or pyramid-shaped. Although they may resemble some puffers, these fish do not "inflate" when stressed like puffers do.

Coloration, habitat and body shape may vary but all of these fish generally have pointed snouts that they used to pick prey items out of rockwork and crevices. They feed on invertebrates like some corals and polyps, crabs, shrimp, mollusks, worms and similar prey. They can be fed a varied meaty diet of fresh or frozen prey in the aquarium as long as the food is appropriately sized for their relatively small mouths.

These fish are not Reef Safe. Many will eat corals, especially smaller-polyped corals and polyps. They can usually be kept with most peaceful tankmates but should not be kept with aggressive tankmates or very active swimmers that can stress these passive weak-swimming fish.

If stressed, these fish can release a toxin into the water that can be harmful to itself and other tankmates. Always remove a struggling boxfish or cowfish into a separate quarantine tank if stressed and monitor their interactions with their tankmates closely. Avoid putting them in a tank with large, aggressive, or very active tankmates.

Visit That Fish Blog for more information from our marine biologists and guest authors on Boxfish, Trunkfish and Cowfish as well as a Species Profile on Longhorn Cowfish.

Specifications

Specifications
Common NameYellow Boxfish - Sm/Med
Scientific NameOstracion cubicus
DifficultyModerate
Reef SafeNo
Invert SafeNo
Community SafeYes
Max Size (in inches)18
Min Tank Size (in gallons)150
OriginIndo-Pacific
Specific Gravity Range1.020-1.024
pH Range8.0-8.4
DietOmnivore
Temperature Range75-82
RestrictedYes

State Restrictions
Alaska
Armed Forces Americas
Armed Forces Europe
Armed Forces Pacific
California
Hawaii
Puerto Rico

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