Yellow Boxfish (Ostracion cubicus / Yellow Boxfish) A unique and highly recognisable marine species, the Yellow Boxfish is famous for its cube-shaped body and bright yellow coloration (especially in juveniles). Despite its slow, awkward swimming style, it is a hardy and fascinating display fish for large marine aquariums. Compatibility:Peaceful but delicate. Best kept with calm, non-aggressive tankmates such as tangs, wrasses, clownfish, and angelfish. Should not be housed with aggressive or fin-nipping species, as stress can trigger toxin release. Reef Compatibility:Reef-safe with caution. Generally does not nip corals, but may consume small invertebrates such as shrimp, snails, and worms. Also produces a toxin when highly stressed or dying, which can be dangerous in closed systems. Diet:Omnivore – feeds on a varied diet including mysis shrimp, brine shrimp, chopped seafood, algae-based foods, and quality marine pellets. Feed small amounts 1–2 times daily. Water Parameters: Temperature: 24–27°C Salinity: 1.023–1.026 SG pH: 8.1–8.4 Minimum Tank Size: 300L Care Level:Moderate – requires stable water conditions, gentle tankmates, and careful handling. Sensitive to stress and poor water quality. Top Tip:Avoid overcrowded or highly aggressive tanks. Provide plenty of open swimming space and stable parameters to minimise stress, as boxfish are highly sensitive despite their hardy appearance.
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