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The Dwarf Pencilfish (Nannostomus marginatus) is a captivating and peaceful schooling fish, highly prized by aquarists for its diminutive size, stunning colors, and unique swimming behavior. Reaching a maximum length of just over an inch, these fish are ideal for nano aquariums and heavily planted setups. Their slender, torpedo-shaped bodies are adorned with a distinctive horizontal stripe, often a deep black or brown, flanked by iridescent gold or reddish hues, particularly vibrant in males during breeding. Unlike many other small fish, Dwarf Pencilfish exhibit a characteristic head-up swimming posture, adding to their charm. They are generally peaceful and shy, thriving in a well-established, mature aquarium with soft, acidic water conditions, reminiscent of their native South American blackwater habitats. A dense planting of live plants, particularly floating varieties, provides essential cover and helps them feel secure, encouraging their best coloration and natural behaviors. They are omnivores, readily accepting a varied diet of high-quality micro pellets, flakes, and live or frozen foods like daphnia, brine shrimp, and cyclops. When kept in groups of six or more, they display fascinating schooling dynamics and are excellent tank mates for other small, peaceful species such as chili rasboras, celestial pearl danios, and small, non-aggressive Corydoras. Avoid housing them with boisterous or fin-nipping fish. Their delicate beauty and serene demeanor make the Dwarf Pencilfish a truly rewarding addition for the dedicated aquascaper or nano tank enthusiast.

A small, peaceful top-dwelling fish. Can be shy.