Rainbow Shark – Epalzeorhynchos frenatum
The Rainbow Shark is a sleek, active freshwater fish admired for its striking appearance and bold personality. Featuring a dark black to bluish body with vivid red-orange fins, the Rainbow Shark makes a beautiful and energetic addition to larger community aquariums.
Although semi-aggressive and territorial, especially toward similar-looking bottom dwellers, Rainbow Sharks can thrive in well-planned community setups with plenty of space and hiding areas.
Key Details:
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Scientific Name: Epalzeorhynchos frenatum
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Common Name: Rainbow Shark, Ruby Shark, Red-Finned Shark
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Origin: Southeast Asia (Tank-Raised in the trade)
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Size Purchased: 1.5" – 2.5"
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Adult Size: ~5" – 6"
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Type: Freshwater Cyprinid
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Temperament: Semi-aggressive, territorial
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Tank Size: 55+ gallons recommended
Water Parameters:
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Temperature: 72–79°F
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pH: 6.5–7.5
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Hardness: Moderate
Diet:
Omnivorous. Provide a varied diet of high-quality sinking pellets, algae wafers, blanched vegetables, and frozen/live foods like brine shrimp and bloodworms.
Care Notes:
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Keep only one Rainbow Shark per tank to prevent aggression.
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Provide caves, driftwood, and plants to establish territories and reduce stress.
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Best kept with medium to large, fast-moving community fish. Avoid housing with timid or long-finned tankmates.
Why Choose the Rainbow Shark?
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Vivid coloration and sleek body shape make it a standout fish.
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Active swimmer that adds energy and personality to the aquarium.
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Hardy and long-lived, suitable for experienced aquarists.