Red Rainbowfish – Brilliant Scarlet-Red Freshwater Schooling Fish
The Red Rainbowfish (Glossolepis incisus) is a spectacular freshwater aquarium fish admired for its brilliant scarlet-red coloration, elegant body shape, and energetic swimming behaviour.
Native to Lake Sentani in Papua, Indonesia, this stunning rainbowfish is particularly famous for the extraordinary coloration of mature males, which can develop a deep crimson-red body with shimmering metallic highlights.
Females and juvenile fish generally display softer olive, silver, or golden tones, creating a beautiful contrast within a group.
Red Rainbowfish are active, social fish that thrive in spacious aquariums with plenty of open swimming space, planted areas, and stable water conditions.
Their lively behaviour, impressive adult size, and remarkable coloration make them an outstanding choice for larger peaceful freshwater community aquariums.
When maintained in groups and provided with a nutritious, varied diet, mature males can display exceptionally vibrant colours, creating a striking centerpiece for any rainbowfish collection.
Care Guide
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Parameter
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Details
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Scientific Name
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Glossolepis incisus (also listed as G. incisa)
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Common Name
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Red Rainbowfish
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Other Names
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Salmon Red Rainbowfish, New Guinea Red Rainbowfish
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Origin
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Lake Sentani, Papua, Indonesia
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Adult Size
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Approximately 12–15 cm
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Temperature
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24–29°C
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pH
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7.0–8.0
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Water Hardness
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10–20 dGH
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Minimum Tank Size
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200 L+ recommended for a group
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Minimum Tank Length
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120 cm recommended
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Diet
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Omnivore; flakes, pellets, frozen and live foods
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Temperament
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Peaceful, active
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Care Level
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Intermediate
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Group Size
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6–8 minimum; preferably more
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Lifespan
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Approximately 5–8 years
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Swimming Level
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Middle / Upper
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Water Flow
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Gentle to Moderate
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Aquarium Type
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Large Planted Aquarium / Community Aquarium
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Special Requirements
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Open swimming space, group housing, stable mineral-rich water
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