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Chromis retrofasciata. The Black Bar Chromis originates from the reefs of the Western Pacific, and is usually found within branching coral heads. They are tan to yellow in coloration with a distinctive vertical black bar where the body meets the tail. Provide a 30 gallon or larger aquarium, with plenty of live rock for these chromis to hide in. They prefer to be in groups of six or more. They are typically a peaceful species, unless they are housed alone. The Black Bar Chromis is an omnivore and should be offered both meaty and vegetable based foods. Feed frozen mysis and vitamin enriched brine shrimp as well as a quality flake food.