Description
Obsidian Tang – Acanthurus gahhm
Overview:
The Obsidian Tang is a striking marine herbivore, known for its deep black to dark gray body with subtle blue highlights and a contrasting vibrant yellow tail. Its bold coloration and active swimming make it a standout in large reef aquariums.
Origin:
Native to the Indo-Pacific, primarily found along coral reefs and lagoons in Red Sea, East Africa, and the western Indian Ocean.
Feeding:
Primarily herbivorous – thrives on marine algae, seaweed, and spirulina-based foods, supplemented occasionally with meaty foods like mysis shrimp for balanced nutrition. Regular feeding helps maintain coloration and digestive health.
Tank Mates:
Best kept with peaceful to semi-aggressive tank mates. Avoid housing with overly aggressive tangs to minimize territorial disputes.
Aggression:
Moderately territorial – may defend feeding areas, especially in smaller aquariums, but generally compatible with other robust fish.
Experience Level:
Intermediate to advanced aquarists – requires a mature aquarium with ample swimming space, stable water conditions, and a proper herbivore diet.
Water Parameters:
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Temperature: 74–80°F (23–27°C)
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pH: 8.1–8.4
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Salinity: 1.020–1.025
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Minimum Tank Size: 125+ gallons
The Obsidian Tang is a visually striking, active herbivore, perfect for reef or large community marine tanks where a bold, dynamic fish is desired.
