Do Possum Wrasses need a deep sand bed?

No. Unlike many other wrasses that dive into the sand to sleep or escape danger, Possum Wrasses prefer to retreat into rock crevices and caves.

Are Possum Wrasses reef safe?

Yes, they are completely reef safe. They will not bother corals, clams, or ornamental shrimp, though they will hunt naturally occurring copepods and very tiny micro-crustaceans.

Why is my Possum Wrasse always hiding?

They are naturally cryptic fish that prefer dimly lit areas and caves. If they feel threatened by bright lights, lack of hiding spots, or aggressive tankmates, they will remain hidden most of the time.

Will a Possum Wrasse decimate my copepod population?

While they do hunt copepods continuously, their small size and slow feeding style mean they have a much lower impact on pod populations compared to Mandarin Dragonets or Sixline Wrasses.

Can I keep multiple Possum Wrasses together?

It is generally best to keep them singly unless you can acquire a confirmed mated pair. In small tanks, individuals of the same species may become territorial towards one another.

MarineMarineIntermediate

Possum Wrasse

Wetmorella spp.

A genus of diminutive, peaceful, and fascinatingly cryptic marine wrasses, perfect for nano reefs with gentle tankmates.

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Ideal Conditions

Temperature: 23 – 27 °C
pH range: 8.1 – 8.4
Hardness: 14 – 21 dGH
Salinity: 1.023 – 1.025 SG
Adult size: 6 – 8 cm
Nano reef or larger: 60 litres+
Lifespan: 5 – 8 years
Diet: Carnivore
Water flow: Low to moderate
Preferred setup: Abundant live rock with ample caves, overhangs, and shaded crevices.

About the Possum Wrasse

The Possum Wrasses (genus Wetmorella) are small, uniquely shaped members of the Labridae family. Commonly encountered species in the aquarium trade include the Yellowbanded (W. nigropinnata) and Whitebanded (W. albofasciata) Possum Wrasses. Known for their pointed snouts, large eyes, and distinctively banded mahogany bodies, they navigate the shadows of reef structures with a deliberate, hovering swimming style. They are highly sought after by nano reef enthusiasts for their diminutive adult size and entirely reef-safe nature.

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Is it right for your tank?

Check Possum Wrasse against a habitat you already keep. We compare water type, temperature, pH, adult size, group needs and everything living there.

Where Possum Wrasse comes from

Native range

Indo-Pacific, Red Sea, Western Central Pacific

Countries / regions

Indonesia, Philippines, Australia, Fiji

Habitat

Coastal and seaward coral reefs, specifically within deep crevices, caves, and coral rubble zones.

Distribution varies slightly by species; W. nigropinnata is widely distributed across the Indo-Pacific, while others have more localised ranges.

Similar species

Pink-Streaked Wrasse
Pseudocheilinops ataenia
Sixline Wrasse
Pseudocheilinus hexataenia
Tanaka's Pygmy Wrasse
Wetmorella tanakai

We’re adding more full species guides as the catalogue grows.

Compatible tank mates

Reviewed guidance based on this species' recorded traits.

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Firefish
Nemateleotris magnifica
Peaceful, occupies the open water column, and will not compete for caves or intimidate the wrasse.
Great
Skunk Cleaner Shrimp
Lysmata amboinensis
Possum wrasses are completely safe with ornamental shrimp and appreciate the cleaning services.
Great
Sixline Wrasse
Pseudocheilinus hexataenia
Sixlines can be territorial and highly aggressive, potentially bullying the timid Possum Wrasse and outcompeting it for copepods.
Compatible with caution
Orchid Dottyback
Pseudochromis fridmani
Dottybacks share the same cave-dwelling habits and can be fiercely territorial, often stressing the peaceful wrasse.
Compatible with caution
Dwarf Lionfish
Dendrochirus brachypterus
Large-mouthed ambush predators will easily swallow a diminutive, slow-moving Possum Wrasse.
Not recommended

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