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Nannostomus marginatus, commonly known as the dwarf or coral red pencilfish, is a small, slender South American fish belonging to the characin family. These fish are typically 2.5 to 4 cm (1 to 2 inches) in length and are popular in aquariums. They inhabit freshwater environments, often preferring slow-moving waters. Pencilfish are known for their feeding habits, picking food from the bottom or plant surfaces. Some species have distinctive swimming postures, with tails up, down, or horizontally. Nannostomus marginatus is one of several species within the genus Nannostomus that are kept as aquarium fish.1

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