Rainbow Shark (Epalzeorhynchos frenatum) – Care & Freshwater Aquarium Guide

Rainbow Shark – Care & Profile

The Rainbow Shark (Epalzeorhynchos frenatum) is a striking freshwater fish admired for its sleek dark body and vivid red fins. Native to Southeast Asia, this semi-aggressive bottom dweller makes a bold centerpiece in medium-to-large aquariums when kept with the right tank mates.

🌊 Quick Facts:

• Scientific Name: Epalzeorhynchos frenatum
• Common Name: Rainbow Shark, Ruby Shark, Red-Finned Shark
• Origin: Southeast Asia (Mekong & Chao Phraya basins)
• Temperament: Semi-aggressive, territorial bottom-dweller
• Adult Size: 5–6 inches
• Tank Size: 55+ gallons recommended
• Diet: Omnivore (algae wafers, sinking pellets, vegetables, frozen foods)
• Water Parameters: 72–79°F, pH 6.5–7.5

✨ Why Choose Rainbow Sharks?

• Striking red fins make them a visual standout
• Hardy and adaptable to different water conditions
• Excellent algae grazer and scavenger
• Active swimmers with unique personality
• Long-lived fish (6–10 years with proper care)

💡 Care Tips:
Provide a spacious aquarium with caves, driftwood, and plants for hiding and territory. Best kept singly to avoid aggression with others of the same species. Choose tank mates carefully—avoid slow, long-finned fish, but fast-moving community fish usually do well.