The males have a copper color, the females are more pale and silverish. Both have white tips on the fins, hence the name. They differ from most other tetras by lacking a small second dorsal (adipose) fin. Silvertip Tetras have a Black area at the base of their cadual fin. The fish are transparent except for that fact that their bodies have an overall Copper sheen. During the night, the copper and black become silver as the fish rests — it reactivates once it becomes active in the morning. It grows to approximately 3 cm (1.25 in) in overall length. Sexual dimorphism is slight, the female having a very slightly larger belly, and slightly paler and silver compared to the male's golden copper color.