The Yellowtail Blue Damsel, Chrysiptera parasema, also known as the Yellow Tail Blue Damsel, features a bright blue body with a neon yellow tail that turns into translucent at the edges of the fins. They are a prime community reef fish that live best in small groups of at least three or more, or else they can become territorial. They are best introduced last into the tank as well. The Yellowtail Blue Damsel is very hardy and eats almost anything contributing to its lifespan of up to five years. The Yellowtail Blue Damsel is a versatile fish that will thrive in almost any home aquarium.