[2] The fish can be a light purple to a deep violet starting at the head which fades mid-body to a golden yellow at the tail.

The Royal Gramma tends to swim more towards the bottom with the depth range between 1 and 20 m (3 and 60 ft).

Due to their relatively peaceful nature, diet, and small size, the royal gramma is considered an ideal inhabitant for most reef aquaria containing coral and other invertebrates.

Notwithstanding this general statement, they can become aggressive towards tank-mates when kept in smaller nano reef tanks.

The royal gramma tends to orient itself to be parallel with the surface to which it is closest, resulting in the fish swimming straight up and down or sometimes upside down beneath ledges.

However, small groups can be kept as long as the tank is large enough and has enough cracks and crevices for each fish to have its own territory.

Although pairs are difficult to find because the difference between male and female is not visible, they are very easy to breed.

The eggs are about 1 mm (0.04 in) and are equipped with small protuberances over the surface with tiny threads extending from them.