- The Red Possum Wrasse has an arrowhead-like shape and is mostly red/orange in color with white vertical stripes when in its juvenile coloration. As the fish matures, it will darken to a deep rust color. 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 Red Possum Wrasse is a very peaceful, active fish that will bring both color and activity to a fish-only or reef aquarium of 30 gallons or larger. 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.