Blue Eye Tang - Ctenochaetus binotatus
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The Blue Eye Tang (Ctenochaetus binotatus) is a small, vibrant tang known for its striking blue eyes and sand-sifting behavior. Peaceful and hardy, this tang is an excellent addition to reef aquariums, providing both algae control and visual interest.
Common Name: Blue Eye Tang
Scientific Name: Ctenochaetus binotatus
Family: Acanthuridae
Size: Up to 5 inches (12.5 cm)
Temperament: Peaceful
Difficulty: Easy
Reef Safe: Yes
Native Region: Found throughout the Indo-Pacific, including the Great Barrier Reef, Indonesia, and the Philippines, typically inhabiting shallow reef flats and lagoons with abundant algae-covered surfaces.
Tank Size: Minimum of 50 gallons
Temperature: 74–80°F (23–27°C)
pH: 8.0–8.4
Salinity: 1.023–1.025
Substrate/Decor: Live rock and sand substrate for grazing and natural sand-sifting behavior; provides open swimming space.
• Algae Control: Actively grazes on detritus and film algae, helping maintain a cleaner tank environment.
• Behavior: Peaceful and active; will forage throughout the tank but may establish a small territory.
• Diet: Herbivorous—supplement grazing with high-quality seaweed sheets and spirulina-based foods.
• Tankmates: Compatible with most peaceful reef fish; avoid aggressive species that may stress the tang.