Shark Rainbow (Epalzeorhynchos Frenatum)

The Rainbow Shark is a classic "oddball" favorite in the aquarium hobby. While it isn't a true shark, its sleek, powerful body and high dorsal fin give it a formidable, shark-like appearance. Its most striking feature is the intense contrast between its dark, velvet-like body and its fiery red-to-orange fins.

For your e-commerce and Shopify development projects, Iwan, this is a "Category Anchor" fish. Because it is so recognizable, it’s a perfect candidate for a featured "Bottom-Dweller" section on your site. Just be sure to include a clear "Compatibility Disclaimer" in the product description, as their personality can be a bit fiery!

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Rainbow Shark (Epalzeorhynchos frenatum)

The Rainbow Shark is a spirited and territorial bottom-dweller native to the river basins of Thailand. It is prized for its deep charcoal-to-black body and vibrant red fins. Unlike many schooling fish, the Rainbow Shark is a solitary creature that takes great pride in "owning" a specific area of the tank. They are active, curious, and excellent at cleaning up leftover food, making them both a beautiful and functional addition to the right setup.

Key Information

• Common Name: Rainbow Shark, Ruby Shark, Red-Finned Shark

• Scientific Name: Epalzeorhynchos frenatum

• Origin: Southeast Asia (Thailand, Cambodia, Laos)

• Max Size: 15 cm

• Lifespan: 5–8 years

• Temperament: Semi-aggressive (Territorial with bottom-dwellers)

• Diet: Omnivore – Algae wafers, high-quality sinking pellets, and frozen foods like bloodworms. They are also excellent natural algae grazers.

• Care Level: Moderate (Due to territorial behavior)

Water Parameters

Parameter	Value
Temperature:	24–28°C
pH:	6.5–7.5
Hardness:	5–15 dGH
Minimum Tank Size:	115L+ (30 Gallons)

Behaviour & Tank Compatibility

The Rainbow Shark is highly territorial toward its own kind and other shark-like fish (such as Red Tail Sharks). You should generally only keep one per tank unless the aquarium is exceptionally large (200L+).

They are peaceful toward fish that inhabit the upper and middle layers of the tank. Ideal tank mates include Gouramis, Rainbowfish, Barbs, and larger Rasboras. Avoid keeping them with shy or delicate bottom-dwellers like small Corydoras, as the Rainbow Shark may chase them away from its territory.

Ideal Tank Setup

• Hiding Spots: Essential. Provide plenty of caves, PVC pipes, or hollow driftwood. A Rainbow Shark that has a secure "home" is much less likely to be aggressive toward tank mates.

• Fine Substrate: Use sand or smooth gravel to protect their sensitive barbels while they forage for food on the bottom.

• Dense Planting: They enjoy navigating through "forests" of plants like Amazon Swords or Java Fern. This also helps break sightlines to reduce chasing.

• Secure Lid: Like many streamlined fish, they are surprisingly good jumpers if they feel threatened or during nighttime exploration.

• Strong Filtration: They come from river environments and appreciate clean, well-oxygenated water with a moderate current.

Why Choose the Rainbow Shark?

The Rainbow Shark is for the aquarist who wants a fish with a "bold" presence. Their constant patrolling of the tank floor and their vibrant color contrast make them a captivating centerpiece. If you provide them with their own cave and choose their tank mates wisely, they are one of the most rewarding and long-lived "sharks" you can keep in a home aquarium.