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The Black Ghost Knife Fish (Apteronotus albifrons) is an enigmatic and captivating freshwater fish, instantly recognizable by its sleek, jet-black body, often adorned with two distinct white bands near the tail, and a single, undulating anal fin that propels it with graceful, almost ethereal movements. Native to the slow-moving rivers and streams of South America, this nocturnal species relies on a weak electric field, generated by a specialized organ, to navigate, locate prey, and communicate in its often murky environment. Growing up to 20 inches in captivity, the Black Ghost Knife Fish requires a spacious aquarium, ideally 100 gallons or more for an adult, with plenty of hiding spots such as caves, PVC pipes, and dense vegetation to mimic its natural habitat. A soft, sandy substrate is preferred, and subdued lighting or dim areas are crucial to make it feel secure, as it is primarily active during twilight and nighttime hours. They are carnivorous, thriving on a diet of live or frozen foods like bloodworms, brine shrimp, and small pieces of fish or earthworms. While generally peaceful towards similarly sized or larger tankmates, they can be territorial and aggressive towards their own kind or other knife fish, making them best suited for single-specimen displays in most home aquariums, or with very carefully selected, robust tankmates that occupy different parts of the water column. Maintaining stable water parameters (pH 6.5-7.5, temperature 73-82°F) and excellent water quality is paramount for their health. This unique and intelligent fish, with its mesmerizing swimming style and fascinating sensory abilities, is a truly rewarding addition for experienced aquarists willing to meet its specific care requirements.

Grows very large; mostly blind.