Rainbow Shark (Epalzeorhynchos frenatum)

Rainbow Shark (Epalzeorhynchos frenatum)

The Rainbow Shark is a striking and energetic freshwater fish, loved for its vibrant red fins and sleek, dark body. Despite its name, it’s not actually a shark—it belongs to the cyprinid family, making it a close relative of minnows. This lively fish spends much of its time exploring the tank and grazing on algae and microorganisms. While young Rainbow Sharks are social, they become more territorial as they mature, especially toward similar-looking species like Siamese Algae Eaters, Flying Foxes, and Garra.

Care & Tank Setup

• Hardiness: Rainbow Sharks are adaptable and thrive in a variety of water conditions.
• Tank Size: Minimum 55 gallons for a single adult; larger tanks recommended for multiple individuals.
• Environment: They prefer tanks with strong filtration, moderate to high water flow, and plenty of hiding spots.
• Lid: Rainbow Sharks are known to jump, so a secure lid is essential.
• Behavior: Generally peaceful with most fish and larger invertebrates, but can be territorial, especially with their own kind. They can be kept alone or in groups of six or more in a spacious tank to reduce aggression.

Diet & Feeding

Rainbow Sharks are omnivores. They will thrive on:

• High-quality dry foods (flakes or pellets)
• Frozen or live meaty foods
• Fresh vegetables such as zucchini or cucumber

A varied diet helps maintain their health and vibrant colors.

Why Choose a Rainbow Shark?

• Stunning, vibrant coloration
• Hardy and adaptable
• Active and engaging behavior
• Does not eat live plants
• Generally peaceful with most tankmates

Tank & Water Requirements

• Temperature: 68°–79°F (20°–26°C)
• pH Range: 6.5–8.0 (mid-range ideal)
• KH: 2–15 dKH
• Origin: Tank-bred; native to Thailand, Cambodia, and Laos

Size

• Adult Size: 5–6 inches (13–15 cm)
• Juvenile Size at Purchase: 1–2 inches (2.5–5 cm)

Rainbow Sharks bring both color and personality to any freshwater aquarium. With proper care and tank setup, they make a fantastic addition to a lively, well-maintained tank