Neon Tetra has a light blue back over a silver colored abdomen. It has an iridescent blue stripe that runs horizontally along each side of the fish, starting at the nose and ending at the adipose fin. They also have a red iridescent stripe that begins in the middle of their body and extends to the base of the caudal fin. The neon tetra is partially transparent, the fins too. Female Neon Tetras are usually bigger, can be identified by their rounder bellies, and a bent iridescent stripe rather than the male’s straight one. At night time, as the Neon Tetra rests, the red and blue stripes become gray and black. The color becomes vibrant again once the Neon Tetra becomes active in the morning.