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Black Ghost Knife Fish - (No Online Purchases) aquascape items Continuum also recommends that youDescription: Black Ghost Knife Fish In Store Pick Up Only The (Apteronotus albifrons) is a captivating and unique freshwater fish that can make a fascinating addition to a larger aquarium. Appearance: They have a distinctive, elongated, ribbon like black body. Two white bands are present on their tail, and a white blaze marks their nose, sometimes extending into a stripe. They lack scales, making them sensitive to water conditions and medications.