Allen's DamselfishThe Allen's Damselfish is also known as Andaman Damselfish and the Allen's Pomacentrus. It was named after Dr. Gerald Allen, the icthyologist who is recognized as the world's authority on damselfishes. This slender fish is neon blue with a blending of yellow near the bottom of the body down into the anal fin. Pomacentrus coelestis, which is similar in appearance, may also be called the Neon Damselfsih. It is a semi aggressive fish that requires hiding