GMO Widow Tetras are genetically modified versions of the Widow Tetra (or Black Skirt Tetra) that have been selectively bred to display vibrant, fluorescent colors such as pink, blue, green, and yellow. They are peaceful, schooling fish that should be kept in groups of six or more in a well-planted aquarium with subdued lighting and open swimming space. These hardy and colorful fish are suitable for beginners and readily accept a variety of foods.