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fish black ghost knifefish animal underwater nature wildlife exotic pets aquarium freshwater tropical predatory nocturnal solitary scavenger carnivore omnivore benthic pelagic tank gravel substrate water plants vegetation green brown black white orange yellow red blue purple pink gray silver gold metallic shiny iridescent scales fins gills eyes nose mouth teeth fangs barbels whiskers sensory communication perception intelligence behavior social solitary territorial aggressive predatory prey predator food diet nutrition health disease parasites fungus bacteria viral infection treatment prevention care maintenance breeding propagation conservation endangered threatened vulnerable rare protected status population decline loss extinction crisis action help save protect future hope survival