Yellow Banded Possum Wrasse

Wetmorella nigropinnata

Saltwater Fish Species Group: Wrasse Family: Labridae

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Water parameters

Temp 76-80 F Temperature

Maintaining a stable and appropriate temperature is critical for the survival of aquatic life.

pH 7.8 - 8.4 potential of Hydrogen

Measuring the acidity or alkalinity of water on a 0–14 scale, where 7 is neutral, 7 is alkaline.

NO3 1-20 ppm Nitrate

While less toxic than ammonia, high nitrate levels (above 40–80 ppm) are important to monitor because they can cause fish stress, stunted growth, and harmful algae blooms.

NO2 <0.0001 ppm Nitrite

It is a highly toxic, intermediate compound in the nitrogen cycle produced from broken-down ammonia

PO4 0.01 - 0.1 ppm Phosphate

It is essential for plant development but must be managed, as excess levels trigger nuisance algae blooms and inhibit coral calcification.

NH3 <0.1 ppm Ammonia

It is the primary killer of aquarium fish, causing gill damage, stress, and death

Ca 380 - 450 ppm Calcium

Supporting the growth, skeletal structure, and shell formation of corals, mollusks, crustaceans, and coralline algae

KH 8 - 12 dKH Alkalinity

It acts as a shield, neutralizing acids to prevent dangerous pH "crashes" that can harm fish, corals, and plants.

Mg 1200 - 1400 ppm Magnesium

It enables coral growth by supporting skeletal formation, assists in metabolic processes, and ensures that calcium is available for corals, clams, and coralline algae.

SG 1.023 - 1.026 SG Salinity

Essential for maintaining stable, natural water parameters, proper osmoregulation, and stress-free environments for marine fish and corals

ORP 250 - 400 mV Oxidation-Reduction Potential

A higher positive mV indicates clean, oxygen-rich water with high water quality, while low readings indicate high pollution.

About Yellow Banded Possum Wrasse

General information

The Banded Possum Wrasse originated from the waters of Indonesia. The Banded Possum Wrasse has an arrowhead-like shape and is red/orange in color with yellow vertical stripes when in its juvenile coloration. As the fish matures the fish will darken to a deep rust coloration. The male and female of this species are very similarly colored, but when courting, the male will display increased color intensity. Colors may vary depending on the fish's mood. The Banded Possum Wrasse is a very peaceful, active fish that will bring both color and activity to a fish-only or reef aquarium. They will not bother any corals or invertebrates making them a perfect fish for the reef aquarium. A single male can be kept with a group of females that is introduced prior to or at the same time as the male. These wrasses like to jump, so a tight fitting canopy is recommended.

Cautions

Wrasse are considered jumpers make sure your aquarium has a tight-fitting canopy or screen cover to prevent the Wrasse from jumping out of your aquarium. Wrasse have been known to jump through the smallest of holes in a canopy. 

Wrasses prefer to have a 2″ (5cm) sandbed to allow them to burrow into the sand to sleep or when they feel like they are in danger. Some people with bare bottom tanks have also added a Tupperware with a 2″ deep sand bed to accommodate the wrasse’s needs. 

They are generally peaceful but may display aggression towards members of the same species.

Cautions

Wrasse are considered jumpers make sure your aquarium has a tight-fitting canopy or screen cover to prevent the Wrasse from jumping out of your aquarium. Wrasse have been known to jump through the smallest of holes in a canopy.

Wrasses prefer to have a 2" (5cm) sandbed to allow them to burrow into the sand to sleep or when they feel like they are in danger. Some people with bare bottom tanks have also added a Tupperware with a 2" deep sand bed to accommodate the wrasse's needs.

They are generally peaceful but may display aggression towards members of the same species.

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