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FishbeginnerSaltwater

Melanurus Wrasse

Halichoeres melanurus

AnimaliaChordataActinopterygiiLabridae

📍 Indo-Pacific — Philippines to Samoa

Ask Finn

Dazzling rainbow colouration — females green-blue, males sporting a vivid magenta-and-green pattern. A sand-diver that buries to sleep. Natural predator of flatworms and pyramid snails.

Size5"
Min Tank30g
semi-aggressive
Zonemid

Care Guide

Diet

Melanurus wrasses are carnivorous and require a varied diet of high-quality meaty foods. Feed mysis shrimp, small crustaceans, copepods, and quality carnivore pellets once daily. They naturally prey on small invertebrates and will help control flatworms and pyramid snails in the aquarium.

Behavior

Active mid-water swimmers that are semi-aggressive, particularly toward smaller fish and invertebrates. They are curious and energetic during the day, but exhibit a unique sand-diving behavior at night, burying themselves in the substrate to sleep. Best kept singly or in pairs, as males can be territorial toward other wrasses.

Breeding

Breeding in captivity is extremely rare and difficult. These wrasses are sequential hermaphrodites with complex spawning behaviors that are poorly understood in home aquariums. Successful breeding requires large, well-established systems with specific environmental triggers and is not recommended for most hobbyists.

Common Diseases

Ich (Marine Ich)

Symptoms

White spots on body and fins, rapid breathing, flashing against rocks, lethargy

Treatment

Raise temperature gradually to 28-29°C, maintain excellent water quality, consider copper-based treatments or hyposalinity in quarantine

Head and Lateral Line Erosion (HLLE)

Symptoms

Pitting or erosion of head and lateral line, loss of pigmentation in affected areas

Treatment

Improve diet with vitamin-enriched foods, enhance water quality, reduce stress, ensure adequate nutrition with varied meaty foods

Parasitic Infections

Symptoms

Excessive scratching, visible parasites, clamped fins, loss of appetite

Treatment

Quarantine affected fish, treat with appropriate antiparasitic medication, maintain pristine water conditions

Bacterial Infections

Symptoms

Torn fins, open sores, cloudy eyes, behavioral changes, loss of appetite

Treatment

Improve water quality immediately, perform frequent partial water changes, consider antibiotic treatment if severe

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Quick Facts

pH
8.1–8.4
diet
carnivore — mysis, pods, crustaceans
maxSize
5 inches
minTankSize
50 gallons
temperature
75–82°F (24–28°C)

Temperature

75–82°F

24–28°C

Stats

Community tips0
Kept by0 hobbyists