Saltwater Fish
Cetoscarus bicolor
Cetoscarus bicolor - Bicolor Parrotfish

Cetoscarus bicolor (Bicolor Parrotfish)

Species Description…

Scientific Name: Cetoscarus bicolor
Common Name: Bicolor Parrotfish
Species Group: Parrotfish
Habitat: Reef Safe with Caution
Care Level: Advanced
Temperament: Semi-aggressive
Diet Type: Herbivore
Role in Aquarium: Showpiece Fish
Max Fish Length: 31.5 (inches)
Min Aquarium Size: 300 (gallons)
Native Range: Indo-Pacific, Red Sea

Overview

  • Native to the Indo-Pacific, frequently found in coral reefs, lagoons, and rocky reef formations.
  • Recognized for its striking coloration that changes as it matures, from a bright orange juvenile stage to a mix of blue, green, and pink as an adult.
  • Known for its beak-like mouth, which is used to scrape algae off rocks and coral.
  • Can grow to a substantial size and requires a large tank with ample space for swimming.
  • Best suited for an established marine aquarium with plenty of live rock for grazing.

Feeding

  • Herbivorous, primarily feeding on algae and coral polyps in the wild.
  • Accepts marine algae sheets, spirulina-based pellets, and fresh seaweed in captivity.
  • Providing a varied plant-based diet supports healthy growth and vibrant coloration.
  • Requires frequent feedings to meet its dietary needs and maintain its energy levels.
  • May consume live rock over time, contributing to bioerosion in reef environments.

Habitat

  • Typically found in reef environments with an abundance of live rock for grazing.
  • Prefers stable water conditions with moderate to strong water flow.
  • Aquarium setups should include large rock structures and open swimming areas.
  • Requires a well-maintained marine tank with high-quality filtration due to its high metabolism.
  • Providing an enriched environment encourages natural behaviors and reduces stress.

Fish Care

  • Optimal water temperature: 74-80°F (23-27°C) to support metabolic function.
  • Preferred pH range: 8.1-8.4, with a salinity level of 1.020-1.025.
  • Requires strong filtration and routine water changes to maintain water clarity.
  • Needs an aquarium large enough to accommodate its size and grazing habits.
  • Providing live rock formations enhances its environment and supports natural feeding behaviors.

Compatibility

  • Generally peaceful but requires tankmates that can tolerate its constant movement and grazing.
  • Compatible with tangs, wrasses, and other herbivorous or semi-aggressive fish.
  • Not entirely reef-safe, as it may damage corals while feeding on algae.
  • Should not be housed with highly aggressive species that may stress it.
  • Providing ample swimming space and hiding spots helps minimize territorial disputes.

Aquarium Behavior

  • A highly active swimmer that constantly explores its environment.
  • Often observed scraping algae off rocks and occasionally biting at tank surfaces.
  • Can exhibit territorial behavior towards other herbivorous fish if space is limited.
  • Providing live rock structures and varied tank decor supports natural grazing habits.
  • Over time, it may become more interactive with its caretaker, particularly around feeding times.