Atrosalarias fuscus. The Tribal Blenny, Atrosalarias fuscus, is also known as the Dusky Blenny, Highfin Blenny, Black Blenny, Black Sailfin Blenny, and Brown Coral Blenny. Their coloration is primarily blackish-purple body to an electric indigo and yellow-white tail. This is a relatively unique and rare species in the aquarium trade that will certainly differentiate your tank from others. They can grow up to 4 inches, and should be kept in a tank no less than 30 gallons. They are best kept as an individual unless you can secure a mated pair, which cannot be guaranteed. We suggest keeping them in a tank with an abundance of live rock in the tank, as they will graze for algae growing naturally in the tank. They will also feed on a herbivore diet thatshould include vegetable matter, including frozen and dried foods containing marine and blue-green algae.The Tribal Blenny is an excellent algae eater making it beneficial for algae control. They are a peaceful species, and should not be housed with aggressive fish. They should also be kept in a tank with a tightly sealed lid to prevent possible jumping. The Tribal Blenny is one of those fish that only sparingly are available for sale on the aquarium market. Their rarity does not, however, make them difficult to keep. They are hardy, and if kept in proper conditions, easy to care for.