The Forktail Blenny (Meiacanthus atrodorsalis), also known as the Yellowtail or Lyretail Fang Blenny, has a beautiful streamline body that changes from a light blue head to a vibrant yellow caudal fin. They have a black streak running from their eyes onto their dorsal fin. The males are typically larger than females, and their colors may change when breeding. They do contain a venomous bite, so have caution when placing hands in the aquarium. They prefer crustaceans, but will occasionally graze for algae among the live rock.