The Chiseltooth Wrasse, Pseudodax moluccanus, is a reef-associated Indo-Pacific species ranging from the Red Sea and South Africa east to the Society, Marquesan, and Tuamotu islands, and north to southern Japan. Adults take on a greyish, greenish, or reddish-brown ground color marked by dark spotting on the scales, with blue facial lines, blue teeth, and a dark caudal fin edged in blue; a pale or white band frequently crosses the caudal peduncle. Juveniles look nothing like the adults, appearing dark or pale blue with bold horizontal stripes that closely mimic cleaner wrasses. Most aquarium specimens settle in near six inches, though maximum reported lengths run considerably larger in the wild.

Adult housing begins at 100 gallons, and the aquarium should be well established before this wrasse is introduced. Layout matters as much as volume: combine generous open swimming lanes with heavy rockwork, caves, and crevices, plus a scattering of loose rubble the fish can work through. A deep bed of fine sand is essential, as the species buries itself at night and whenever startled, so avoid coarse or sharp substrate that would discourage this behavior. Moderate to strong water movement suits an active forager of this type, and a tight-fitting lid is mandatory because a frightened individual will jump. Expect rubble to be overturned and the sand bed to be disturbed regularly.

In the wild, this carnivore forages across sand, rock, and rubble for small benthic invertebrates, with documented prey including small snails, worms, and shrimp; algae has also been reported in its diet. Juveniles sometimes pick external parasites from other fishes, mirroring the cleaner wrasses they resemble.

In the aquarium, build the menu around varied marine meaty foods: mysis shrimp, vitamin-enriched brine shrimp, finely chopped seafood, and other marine-based frozen, fresh, or live preparations. Feed at least twice daily, and more frequent smaller meals suit an animal that forages almost continuously. A steady feeding schedule also helps keep attention away from ornamental invertebrates.

Mysis Shrimp Vitamin-Enriched Brine Shrimp Chopped Seafood Frozen Marine Preparations Live Marine Foods
Adults are solitary and restlessly active, spending the day probing sand, ledges, and rubble piles for prey. Keep only one per aquarium, since adults may turn aggressive toward conspecifics, and expect a semi-aggressive attitude that can extend to harassment of smaller or timid fishes. Choose larger, robust, similarly active tankmates that will not be intimidated, and introduce the wrasse thoughtfully into an established community.

This species is not reef safe. It hunts benthic invertebrates, so ornamental shrimp, small snails, and other mobile invertebrates should be considered at risk even though the wrasse generally leaves coral tissue alone. Its vigorous burrowing compounds the problem by lifting clouds of sand that can settle on and irritate corals, which is why a fish-only system with robust companions is the most reliable way to keep it.

FAQ

Frequently Asked Questions

About the Chiseltooth Wrasse

  • What size and layout should the aquarium have?
    Provide a mature aquarium of at least 100 gallons with open swimming space, extensive rockwork and caves, loose rubble to sift through, and a deep fine-sand bed for burrowing. A tightly fitted lid is necessary because startled individuals jump.
  • Is the Chiseltooth Wrasse suitable for a reef aquarium?
    No. It preys on benthic invertebrates such as shrimp and small snails, and its forceful sand-burrowing can bury or irritate corals, making a fish-only system the safer choice.
  • Can more than one be kept together?
    Keep this wrasse singly, as adults may become aggressive toward their own species. Pair it with larger, robust tankmates that will not be easily harassed.