Saltwater Fish
Dusky Wrasse

Species Description…

Scientific Name: Halichoeres marginatus
Common Name: Dusky Wrasse
Species Group: Wrasses
Habitat: Reef Safe with Caution
Care Level: Intermediate
Temperament: Semi-aggressive
Diet Type: Carnivore
Role in Aquarium: Community Fish
Max Fish Length: 5 (inches)
Min Aquarium Size: 50 (gallons)
Native Range: Indo-Pacific
Halichoeres marginatus - Dusky Wrasse

Halichoeres marginatus (Dusky Wrasse)

Overview

  • Native to the Indo-Pacific region, commonly found in coral reefs, lagoons, and sandy coastal areas.
  • Characterized by its greenish-yellow body with subtle blue markings along its head and fins.
  • A peaceful and active wrasse species, often seen darting through reef structures.
  • Juveniles display a more intense coloration, which gradually fades into a dusky appearance as they mature.
  • Often used in reef tanks to help control unwanted pests such as flatworms and bristle worms.

Feeding

  • Carnivorous diet, primarily feeding on small crustaceans, copepods, and worms.
  • Readily consumes frozen and live foods such as mysis shrimp, brine shrimp, and chopped seafood.
  • Can be trained to eat high-quality marine pellets and flake foods.
  • Requires multiple small meals throughout the day due to its high metabolism.
  • Thrives in tanks with a sandbed, where it can naturally hunt for hidden prey.

Habitat

  • Commonly found in coral reef slopes, sandy lagoons, and reef edges.
  • Requires an aquarium with open swimming space and a fine sand substrate for burrowing.
  • Best kept in tanks with live rock to provide shelter and foraging opportunities.
  • Moderate to strong water flow is recommended to simulate natural reef conditions.
  • A minimum tank size of 75 gallons is recommended due to its activity level.

Fish Care

  • Optimal water temperature: 74-80°F (23-27°C).
  • Ideal pH range: 8.1-8.4, with a specific gravity of 1.023-1.026.
  • Requires stable water conditions and a well-maintained aquarium.
  • Can be sensitive to sudden fluctuations in salinity and temperature.
  • Regular sandbed maintenance is essential, as it burrows at night for protection.

Compatibility

  • Generally peaceful but may become territorial towards similar wrasses.
  • Compatible with other peaceful reef fish such as clownfish, gobies, and tangs.
  • Should not be housed with overly aggressive species that may harass it.
  • Reef-safe with corals but may consume small ornamental shrimp or snails.
  • Does well in a community setting but may establish a preferred area in the tank.

Aquarium Behavior

  • Highly active swimmer, often exploring every part of the aquarium.
  • Frequently seen picking at rocks and sand in search of small invertebrates.
  • Burrows in the sand at night for protection, emerging in the morning.
  • Displays curiosity towards new tank additions and environmental changes.
  • Thrives in tanks that mimic its natural reef habitat with plenty of space and hiding spots.