Acanthurus lineatus — Clown Tang (also known as Striped Surgeonfish, Lined Surgeonfish)
Family: Acanthuridae
Origin: Indo-Pacific — including the Great Barrier Reef, Indonesia, Sri Lanka, and East Africa
Size: Up to 38 cm (15 inches)
Lifespan: 10–20 years with proper care
 
Natural Habitat
Environment: Coral reef crests, outer reef slopes, and high-energy reef flats
Water Conditions: Strong water flow and high oxygen levels
Temperature Range: 24–28°C (75–82°F)
 
Physical Description
Body Shape: Laterally compressed, streamlined oval body
Coloration:
Bright blue and yellow horizontal stripes across a silvery base
White ventral area and orange-ringed eyes
Tail base armed with a sharp scalpel-like spine
Fins: Long dorsal and anal fins with similar striping; transparent caudal fin
 
Aquarium Care
Tank Size: Minimum 180 gallons (680 litres)
Water Parameters:
pH: 8.1–8.4
Salinity: 1.020–1.025 SG
Temperature: 24–28°C (75–82°F)
Water Flow: High; simulates natural reef current
Substrate: Sand or crushed coral
Décor: Plenty of live rock for grazing, with ample open swimming space
Filtration: Powerful marine filtration with protein skimmer and strong circulation
 
Diet
Type: Herbivore
Preferred Foods:
Marine algae (nori), spirulina, seaweed sheets
Occasional meaty foods like mysis shrimp for protein boost
Feeding Frequency: 2–3 times daily
 
Behavior & Tank Mates
Temperament:
Can be highly territorial and aggressive, especially with other tangs
Requires assertive tank mates and large space to diffuse aggression
Compatible Tank Mates:
Semi-aggressive species like large wrasses, triggers, angels
Not suitable for docile or small reef fish
Behavior Notes:
Extremely active swimmer; thrives in high-energy tanks
Sensitive to stress and poor water quality
 
Breeding
Spawning Method: Broadcast spawner
Breeding Conditions:
Not bred in captivity; wild spawning observed at dusk in open water
Fry Care:
Planktonic larvae with complex rearing needs