This fish is named for its distinctive head-down swimming position (at 45°). These fish usually remain in the shade, emerging to feed.

The lemon tetra is a species of tropical freshwater fish which originates from South America, belonging to the family Characidae.

Hemigrammus pulcher is a semi-popular aquarium species, also known as the pretty tetra, garnet tetra or black wedge tetra

The dawn tetra, panda tetra, or [Rio] Paraguay tetra comes from the Rio Paraguay basin in Paraguay and Brazil.

The black tetra, also known as the black skirt tetra, petticoat tetra, high-fin black skirt tetra, black widow tetra and blackamoor, is a freshwater fish of the characin family.

It is native to the Paraguay River basin of south-central Brazil

Albino Black tetra , with transparent to sliver dorsal and anal fins, vibrant and shiny on the body.

The black phantom tetra, or simply phantom tetra, is a small freshwater fish of the characin family of order Characiformes.