Saltwater Fish
Thalassoma hardwicke (male)
Thalassoma hardwicke (male) - Sixbar Wrasse

Thalassoma hardwicke (male) (Sixbar Wrasse)

Species Description…

Scientific Name: Thalassoma hardwicke (male)
Common Name: Sixbar Wrasse
Species Group: Wrasses
Habitat: Reef Safe with Caution
Care Level: Intermediate
Temperament: Semi-aggressive
Diet Type: Carnivore
Role in Aquarium: Showpiece Fish
Max Fish Length: 8 (inches)
Min Aquarium Size: 100 (gallons)
Native Range: Indo-Pacific, including the Red Sea, East Africa, and Southeast Asia

Overview

  • Native to the Indo-Pacific, commonly found in coral reefs, lagoons, and rocky coastal areas.
  • Recognized for its striking coloration, with bright green and blue hues in mature males, contrasted with bold black bands.
  • An active and fast-swimming species that constantly explores its surroundings.
  • Exhibits sexual dimorphism, with males displaying more vibrant coloration and distinct patterns compared to females.
  • Best suited for aquariums with open swimming space, live rock structures, and strong water flow.

Feeding

  • Carnivorous, feeding on small invertebrates, crustaceans, and plankton in the wild.
  • Thrives on a diet of frozen mysis shrimp, brine shrimp, krill, and high-quality marine pellets.
  • Readily accepts prepared foods but benefits from occasional live feedings to stimulate natural hunting behaviors.
  • Should be fed multiple times per day to meet its high energy demands.
  • A varied diet supports immune function and helps maintain vibrant coloration.

Habitat

  • Prefers reef-associated environments with rock formations, sandy areas, and strong water movement.
  • Frequently seen darting in and out of coral structures while foraging for food.
  • Aquarium setups should include ample rockwork for shelter and open swimming space.
  • Requires stable water conditions and high-quality filtration to accommodate its active nature.
  • Providing a spacious and well-oxygenated environment helps maintain its natural activity levels.

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 frequent water changes and strong filtration to maintain optimal water quality.
  • Generally reef-safe but may prey on small invertebrates and crustaceans.
  • Providing a high-energy diet and a stimulating environment ensures long-term health.

Compatibility

  • Generally peaceful but may display territorial behavior, especially towards smaller or slower-moving fish.
  • Compatible with tangs, angelfish, clownfish, and other fast-swimming reef-safe species.
  • Should not be housed with overly aggressive tankmates that may stress or intimidate it.
  • Best suited for a community aquarium with other active and semi-aggressive fish.
  • Providing multiple hiding areas and structured rock formations helps minimize aggression.

Aquarium Behavior

  • A highly active and inquisitive species that constantly explores its environment.
  • Frequently observed darting between rock formations and patrolling its territory.
  • More confident in a well-established aquarium with plenty of open swimming space.
  • Providing a structured tank with caves and ledges encourages natural behaviors.
  • Over time, it may recognize its caretaker and exhibit anticipation during feeding times.