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Ctenochaetus marginatus

Ctenochaetus marginatus – commonly known as the Striped-fin Surgeonfish, Blue-spotted Bristletooth, Bluespotted Surgeonfish, or Starry Kole Tang – is a striking, algae-grazing marine fish renowned for its dark brown body adorned with fine blue spots on the head and sides, plus narrow blue stripes on the fins. A peaceful herbivore and 100% reef-safe, it excels…

Description

Aquarium Requirements:

  • Tank Size: 100 gallons (380 L) minimum for juveniles; 180+ gallons (680+ L) for adults
  • Water Parameters:
    • Temperature: 75–82°F (24–28°C)
    • pH: 8.1–8.4
    • Salinity: 1.020–1.025 SG
    • Ammonia/Nitrite: 0 ppm
    • Nitrate: <20 ppm
    • Water Flow: Moderate to strong, turbulent (10–15× tank volume per hour)
    • Lighting: Moderate to high (PAR 150–250) to support algae growth on live rock

Size & Lifespan:

  • Adult Size: 10–11 inches (25–27 cm)
  • Lifespan: 8–15 years with proper care and diet

Behavior & Tank Mates:

  • Diurnal, peaceful grazer that forages constantly on algae films; prefers groups in the wild but best kept singly or in pairs/groups in 200+ gallons
  • Low aggression overall; may nip at other bristletooths or similar surgeonfish if territory is limited
  • Compatible with:
    • Peaceful community fish like clownfish, chromis, gobies, blennies, and cardinalfish
    • Other herbivores (e.g., Kole Tangs if introduced together)
    • Avoid: Aggressive species, small nano fish, or overcrowded tanks with multiple tangs
  • Fully reef-safe – excellent for algae control without harming corals or inverts
  • Features a sharp caudal spine for defense – handle with care to avoid injury

Diet & Feeding:

  • Strict herbivore with specialized “bristle” teeth for scraping fine algae; sensitive mouth requires soft, filamentous foods
  • Feed 3–5 times daily in small portions:
    • Nori/seaweed or spirulina sheets on a veggie clip (primary diet)
    • Algae-based flakes and pellets (e.g., Ocean Nutrition Seaweed Deluxe, New Life Spectrum AlgaeMAX)
    • Blanched veggies like lettuce, spinach, or zucchini; macroalgae scraps
    • Occasional mysid or brine shrimp for variety, but prioritize veggies
  • Essential: Mature tank with live rock for natural grazing; supplement with algae reactor if needed

Additional Care Notes:

  • Prone to ich, velvet, and head/lateral line erosion (HLLE) from poor diet/water quality – quarantine 4–6 weeks mandatory
  • Drip acclimate slowly (2–3 hours); protect sensitive mouth during handling/transport to prevent damage
  • Thrives in slightly “dirty” systems with detritus for feeding; avoid over-cleaning rocks
  • Spots may fade if stressed or underfed – maintain algae access for vibrant color and health
  • Provide rockwork with crevices for hiding and grazing surfaces
  • UV sterilizer, protein skimmer, and refugium recommended for disease prevention
  • Wild-caught only – not captive-bred
  • Valuable for natural algae management in reef setups