Retro Chromis or The Black Bar Chromis originated from reefs located in the Western Pacific, and is typically found in branches of coral heads. They are yellow to tan in appearance and have a distinctive vertical black bar at the point where the body joins the tail. Set up the fish with a 30 gallon or more aquarium that has plenty of live rock available for the chromis fish to hide in. They prefer being in groups of at least six. They tend to be peaceful, except when they live alone. This Black Bar Chrromis can be described as an omnivore that should be fed both meaty and plant-based food items. Feed frozen mysis and vitamin-enriched brine shrimp, as well as high-quality flake foods.