The Pencil Blue Nose Wrasse, Pseudojuloides kaleidos, is a slender, strongly dichromatic pencil wrasse from the Indo-West Pacific, with specimens offered in the trade collected from the Maldives. Juveniles and females wear muted brownish-pink to orange-pink tones offset by a pale yellow snout, while terminal males transform into a mosaic of blue, green, pink, and yellow. The most reliable identification cues on a mature male are the blue stripe along the dorsal fin, the broad green field behind the eye, a largely yellow tail, and flanks that darken as the fish matures. In the wild the species associates with rubble slopes, reef flats, and current-swept channels between roughly 5 and 35 meters.

Adult housing should begin at 75 gallons, and additional length is welcome because these wrasses cover ground continuously. Build the display around a mature, well-filtered system with wide open sand and water column for cruising, plus substantial rockwork riddled with caves and crevices. A deep sand bed is not optional: this fish buries itself at night and dives into the substrate when startled, so fine, loose sand of adequate depth is part of its basic security. Seal the top of the aquarium with a tight-fitting lid, since a spooked pencil wrasse will jump. Wild fish favor current-prone channels, so moderate water movement across open areas suits them well.

Expect a fish reaching about 6 inches and a care level best described as moderate. The chief challenges are the initial feeding period and providing tankmates calm enough to let a timid, fast-moving wrasse settle in. Once established in a stable reef or fish-and-invertebrate system with appropriate sand and rock structure, it becomes a durable, animated resident.

Pencil wrasses forage as zooplanktivores and pickers of small benthic invertebrates, working rubble and live rock surfaces for amphipods and similar prey. In the aquarium, treat this species as a carnivore requiring small, soft-bodied meaty items. Mysis shrimp, enriched live brine shrimp, small feeder shrimp, assorted frozen preparations, and finely chopped marine flesh all make appropriate staples. A mature system with a productive live rock fauna supplies valuable between-meal grazing.

Newly imported specimens may ignore prepared food at first, so select an individual that is already swimming actively and showing clear interest in feeding. Live mysis or live brine shrimp are effective triggers for a reluctant fish, and several small feedings spread through the day are recommended while the wrasse acclimates. Once it is eating confidently, continue offering a varied rotation of small meaty foods at least twice daily to support its high activity level.

Mysis Shrimp Live Brine Shrimp Small Feeder Shrimp Frozen Carnivore Preparations Finely Chopped Marine Flesh Amphipods
In the wild, juveniles and females move in small groups while terminal males patrol comparatively large stretches of reef alone. Aquarium specimens are peaceful, restlessly active, and frequently timid, especially in the first weeks after introduction. Keeping more than one may be possible in a spacious display, though the safest approach is a single individual or a male with females in a tank offering plenty of open territory. Boisterous or established aggressive fish will drive this wrasse into the sand and keep it from feeding, so avoid aggressive tangs, triggers, groupers, damsels, and maroon clownfish. Gentle, deliberate tankmates allow it to establish a routine quickly.

This species is reef safe and can be displayed among corals, with no species-specific evidence of coral consumption. Mobile invertebrates are a separate matter. Because pencil wrasses hunt small benthic prey and have been reported to take hard-shelled invertebrates, ornamental shrimp, small crabs, snails, and clams should be considered at some risk. Aquarists who prize a specific cleanup crew or prominent invertebrate collection should weigh that possibility before adding this wrasse, while reef keepers focused on corals will find it a well-behaved and colorful addition.

FAQ

Frequently Asked Questions

About the Pencil Blue Nose Wrasse

  • Is the individual already eating prepared aquarium food?
    Choose a specimen that swims actively and shows obvious interest in food, since newly imported pencil wrasses sometimes refuse prepared items. Live or enriched mysis and brine shrimp usually start them feeding, after which varied small meaty foods can be offered several times daily.
  • Does the aquarium provide the right sleeping and escape habitat?
    Yes, and it is essential. The tank should be established and well filtered with open swimming room, rock caves and crevices, a deep sand bed for nighttime and fright-induced burial, and a secure lid to prevent jumping.
  • Is it safe with a reef cleanup crew?
    Not reliably. Although it is reef safe around corals, this wrasse hunts small benthic prey and may take hard-shelled invertebrates, so shrimp, crabs, snails, and clams should be regarded as uncertain companions.