A hardy, vividly patterned Halichoeres wrasse covered in neon green and orange pinstripes that change as it matures from juvenile to terminal male. Active and reef-safe, it is prized for hunting pest snails, flatworms, and bristleworms while staying easy to feed.
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Western Pacific, from Indonesia to Fiji and southern Japan
Origin
Old World
Climate
🌴 Tropical
Water type
🌊 Marine
Family
Labridae
Genus
Halichoeres
Part of the Wrasses
Wrasses (family Labridae) are an enormous, diverse group of active, colorful reef fish ranging from tiny fairy and flasher wrasses to large predators. Many sand-diving species sleep buried in the substrate, most are accomplished jumpers, and several are prized for controlling pest invertebrates in reef aquariums.
From the minimum an animal needs to be kept humanely, up to the ideal setup. Bigger is almost always better — minimums are floors, not targets.
Photo coming soon
Minimum
Sand-bed reef
55 gal / 200 L reef with sand
Halichoeres melanurus is a sand-diver — needs 5+ cm of fine sand to sleep in. Active hunter of small pests (flatworms, pyramid snails). Tight lid mandatory; they jump.
Photo coming soon
Recommended
Long mature reef
75–90 gal / 280–340 L
More swimming length and rockwork. Generally reef-safe but may pick at ornamental shrimp/clams. Feed varied meaty foods 2× daily to keep colour.
Photo coming soon
Ideal
Large mixed reef
125 gal+ / 470 L+ mixed reef
Spacious reef with deep sand and dense rock seams. Mature male displays full electric green-purple colour and natural patrolling behaviour eating pests.
Life & growth stages
How this animal changes through its life — each stage often has its own care, diet and space needs.
Photo coming soon
Egg
Fish eggs are small, translucent spheres, often laid in clutches on plants, substrate, or in a nest — or carried/brooded by a parent in livebearing and mouth-brooding species. A dark eye spot and the curled embryo become visible inside as development progresses.
Photo coming soon
Fry
Newly hatched fry are tiny and semi-transparent, frequently still carrying a yolk sac that fuels them before they feed freely. They lack full fin structure and adult coloration, staying near cover until they can swim and forage on their own.
Photo coming soon
Juvenile
Juveniles look like miniature adults but with developing fins and muted or different markings; many species shift pattern and color as they mature. Growth is rapid at this stage given clean water and steady feeding.
Adult
Adults show the species' full size, finnage, and mature coloration, and are sexually mature. Many fish develop sex-specific differences in size, color, or fin shape, which can intensify during breeding.
Habitat & enclosure
Provide a minimum of 50 gallons with a footprint long enough for open swimming, since this is an energetic, all-day swimmer. Aquascape with plenty of live rock for grazing and a deep, fine sand bed because the melanurus wrasse dives into the sand to sleep and when startled. A secure, gap-free lid is essential, as these wrasses are accomplished jumpers.
Maintain stable tropical reef parameters: temperature 72-82 F (22-28 C), pH 8.1-8.4, salinity 1.023-1.026 specific gravity, and moderate flow. A mature tank with abundant natural microfauna keeps the fish well fed and richly colored between feedings.
Substrate
A deep bed of fine sand (at least 1-2 in / 2.5-5 cm) is mandatory, because this wrasse buries itself to sleep and to escape threats. Pair it with generous live rock for grazing surfaces and crevices.
Equipment & setup
Run a marine system with a protein skimmer, strong biological filtration, and a reliable heater; add a chiller in hot climates. Provide moderate flow from powerheads, standard reef lighting, and a tightly fitting lid to prevent jumping.
Diet
A micro-predator that hunts small invertebrates across the rocks and sand, including copepods, amphipods, pest snails (such as pyramidellids), flatworms, and small bristleworms, which makes it useful for reef pest control. In the aquarium it eagerly accepts frozen mysis and brine shrimp, finely chopped seafood, and quality marine flakes and pellets.
Feed one to two times daily; a mature reef with live rock supplements its diet with constant natural grazing. It is a fast, confident feeder that rarely refuses food once settled.
Behavior & temperament
Active, bold, and constantly on the move, the melanurus wrasse is generally peaceful toward unrelated tankmates but can become assertive as it matures, especially toward other wrasses or small bottom fish. It is reef-safe with corals but may pick at ornamental snails, small shrimp, tubeworms, and other small motile invertebrates, so it is not fully invertebrate-safe.
Keep one per tank unless the aquarium is very large, as it is aggressive toward similar wrasses. Introduce it after more timid fish are established, and provide ample rockwork sightlines to diffuse territorial behavior.
Health
Hardy and disease-resistant once settled, but like all wrasses it is vulnerable to ich and marine velvet after shipping, so quarantine new arrivals and keep water parameters stable. A deep, soft sand bed is important: without it the fish cannot bury at night and becomes chronically stressed.
Wrasses can be sensitive to copper, so treat cautiously. The most common keeper issue is a startled fish jumping from an open tank or shooting under the sand and not resurfacing for a day or two after a disturbance, which is usually normal behavior.
Tips, DIY & hacks
Use this wrasse as a natural control for pest pyramidellid snails on clams and for flatworm outbreaks. Drip-acclimate and quarantine before adding to the display, and make sure the sand bed is in place before introducing the fish. Keep small ornamental shrimp and tubeworms in mind, as they may become prey.
