Valenciennea muralis is part of a genus of gobies known as Sleeper Gobies; it has a large mouth for sifting small invertebrates out o fthe sandbed. It is white with light dusky spots and faint orange- or red-brown horizontal stripes down the mid-body.
In nature they inhabit shallow coastal sand and rubble flats. Mural Sleeper Gobies stay near the bottom of the tank, sifting through sand and hiding in the rockwork. Make sure your substrate is fine enough that they can pass the grains through their gills without causing damage.
They are peaceful toward other fish, but may be aggressive toward other gobies. Adults occur in pairs while juveniles were often seen in small groups. Breeding pairs are commonly found sharing a single burrow. They eat a mixture of frozen and flake foods.