The Dwarf Neon Rainbowfish has most of the characteristics of the rainbowfish family, except in miniature. These fish only reach up to 2 - 2.5 inches in length.They have the long body that deepens with age, and older males usually develop the pinched in faces (look at head size compared to body size when the fish is in profile any you will see a noticeable indentation). They also have the big eyes and the twin dorsal fins of their cousins.
A few unique characteristics of the Neon Rainbow Fish include the brightly colored fins that are red on males and yellow on females. The body color is basically pinkish gray but the scales will light up in a bright blue by reflecting lighting hitting them from the front. The range of blue tones is surprising, it can be from a lavender to a teal depending on the light.