Black Arrow Tetra – Rare Brazilian Freshwater Tetra with Stunning Iridescent Colours
The Black Arrow Tetra (Inpaichthys luizae) is a beautiful and uncommon freshwater aquarium fish admired for its striking black diagonal stripe, shimmering blue-purple coloration, and vibrant orange fins.
Native to the Rio Tapajós drainage in Brazil, this fascinating species features a sleek, streamlined body with an unmistakable dark arrow-shaped marking extending toward the tail.
Under suitable aquarium lighting, mature specimens can display attractive metallic blue, violet, and silver tones, beautifully contrasted by warm orange and yellow fin coloration.
Black Arrow Tetras are peaceful, social fish that thrive in groups and make an excellent addition to carefully maintained planted aquariums.
Their compact size and graceful swimming behaviour make them particularly attractive for aquascaping enthusiasts and collectors of unusual South American tetras.
With their distinctive appearance, fascinating behaviour, and relatively recent introduction to the aquarium hobby, Black Arrow Tetras offer a unique opportunity to keep a remarkable freshwater species.
Care Guide
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Parameter
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Details
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Scientific Name
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Inpaichthys luizae
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Former Trade Name
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Inpaichthys sp. "Black Arrow"
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Common Name
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Black Arrow Tetra
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Origin
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Mato Grosso, Brazil
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Native River System
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Rio dos Peixes / Rio Juruena / Tapajós Basin
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Adult Size
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Approximately 3.5–4 cm
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Temperature
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22–27°C
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pH
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5.5–7.0
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Water Hardness
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2–10 dGH
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Recommended Tank Size
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60–75 L+
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Diet
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Omnivore / Micropredator
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Temperament
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Peaceful
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Care Level
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Easy to Intermediate
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Group Size
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8–10+ recommended
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Lifespan
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Approximately 3–5 years, estimated
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Swimming Level
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Middle
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Water Flow
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Gentle to Moderate
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Aquarium Type
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Planted Aquarium / South American Community
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Special Requirements
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Soft water, stable conditions, group housing, subdued lighting
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