🌈 Rainbow Shark (Epalzeorhynchos frenatum) – Colorful Semi-Aggressive Bottom Dweller

The Rainbow Shark is a stunning freshwater fish known for its sleek black body and vivid red fins, bringing bold contrast and movement to aquariums. Despite its name, it’s not a true shark but gets its nickname from its shark-like shape and active swimming style.

Rainbow Sharks are territorial yet manageable in the right setup. They do best in spacious aquariums with plenty of hiding spots, smooth decor, and compatible tank mates.

🌟 Key Features

• 🌈 Striking Appearance: Jet-black body with bright red or orange fins
• 🐠 Dynamic Personality: Active swimmer that patrols the bottom of the tank
• ⚔️ Semi-Aggressive: Best kept solo or with similarly sized, non-aggressive species
• 🌿 Algae Grazer: Helps keep surfaces clean between meals
• 💧 Hardy & Long-Lived: Can thrive for up to 8 years with proper care

⚙️ Care Guide

• Scientific Name: Epalzeorhynchos frenatum
• Adult Size: 5–6 inches
• Tank Size: Minimum 50 gallons
• Water Temperature: 72–82°F
• pH: 6.5–7.5
• Diet: Omnivore – algae wafers, sinking pellets, bloodworms, and blanched vegetables
• Behavior: Territorial bottom dweller
• Tank Mates: Larger tetras, rainbowfish, barbs, loaches, or peaceful cichlids

❓ FAQ

Q: Can I keep more than one Rainbow Shark?
A: Only in very large tanks (125+ gallons). They are territorial and may fight with others of the same kind.

Q: Are they good for planted tanks?
A: Yes — Rainbow Sharks appreciate hiding spaces among plants but may dig lightly.

Q: Do they eat algae?
A: Yes, they graze on algae and leftover food, though they’re not primary algae eaters.