GloFish Sunburst Orange Tetras are not injected or dyed. They breed and reproduce naturally with this fluorescent color. These Tetras look great under either regular daylight bulbs or under an actinic bulb. One of the hardier Tetras, this peaceful fish prefers to school and will do fine in well-lit aquariums. While requiring some swimming space, This fish will also appreciate cover along the perimeter of the aquarium.