flame tetras
Substantiv
The flame tetra (Hyphessobrycon flammeus), also known as the red tetra or Rio tetra, is a small freshwater fish of the characin family Characidae. This tetra was first introduced as aquarium fish in 1920 by C. Bruening, Hamburg, Germany, and formally described in 1924 by Dr. George S. Myers.
https://en.wikipedia.org/wiki/Flame_tetra