Rainbow Shark
Epalzeorhynchos frenatum
Rainbow Shark (Epalzeorhynchos frenatum) — Intermediate care, Semi-aggressive, under Barb & Shark. Minimum tank in the app: 32 US gal min; aim for 68–79°F and pH 6–7.8. The Rainbow Shark is suited for intermediate aquarists who appreciate a dynamic and visually striking species.

Captive lifespan reflects typical experience in a home aquarium, not maximum recorded age; genetics, sourcing, and care vary.
Natural distribution
Asia
- East & Southeast Asia
Regional colours match the stocking calculator’s origin map.
Rainbow Shark Tank Setup
Opt for a spacious layout that incorporates ample hiding places using rocks and driftwood to diffuse aggression. A sandy substrate is preferable, and moderate water flow can enhance the natural environment. Lighting should be moderate to bright, allowing for natural behavior displays without overwhelming the fish.
What Do Rainbow Sharks Eat?
Rainbow Sharks are omnivores with a competitive feeding style, often outpacing slower tankmates. A varied diet, including high-quality sinking pellets and occasional plant matter, is crucial for their health and vibrant coloration.
Rainbow Shark Tank Mates
Ideal tank mates include similarly sized, robust species that can hold their own, such as larger barbs or other semi-aggressive fish. Avoid slow-moving or long-finned species, as they are likely to become targets. Intraspecies interactions benefit from larger groups to mitigate aggression, but overly crowded conditions can lead to stress.
Are Rainbow Sharks Good for Beginners?
We rate this as intermediate. Budget time for testing, maintenance, and watching behaviour if the water looks fine but the fish do not. Aquarists often underestimate the need for group dynamics, leading to stressed individuals and increased aggression in smaller groups. neglecting the tank's structure can exacerbate territorial disputes and health issues due to stress.
Building a community? Run the full list through the stocking calculator before you add anything else.
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