Rainbow Shark (Epalzeorhynchos frenatum)
A vibrant carp species native to Southeast Asia, the Rainbow Shark makes an excellent centerpiece for mid- to large-sized aquariums. Omnivorous by nature, these fish are not specialized algae eaters, though they often help clean plant leaves unexpectedly.
Known for their territorial behavior, Rainbow Sharks are best housed either individually or in large groups of 4 or more to reduce aggression.
Specifications
| Species | Epalzeorhynchos frenatum |
|---|---|
| Size (adult) | Up to 1.5 inches |
| Feeding Type | Omnivore |
| Group Size Recommendation | 4 or more (or single specimen) |
FAQ
Are Rainbow Sharks good for cleaning algae?
Rainbow Sharks are not specialized algae eaters, but they do help clean plant leaves, which can benefit plant health in the aquarium.
How big do Rainbow Sharks grow?
These are young specimens, typically around 1.5 inches in size. They can grow to slightly larger sizes as they mature.
Can Rainbow Sharks be kept with other fish?
Due to their territorial nature, Rainbow Sharks should be kept in groups of 4 or more or kept alone. They may not coexist well with small or shy species.

Bella Clarkson –
The Rainbow Sharks are very colorful and add a lot of visual interest to my 55-gallon tank. I kept them in a group of five and they seem to get along well. They eat a mix of flakes and sinking pellets, and I notice the plants look cleaner than before.
Kevin Howard –
I bought these as a centerpiece for my aquarium. They are active and show off their bright colors. I had to keep them in a group to avoid aggression. They don’t eat algae much, but they do help keep plant leaves tidy.
Heather Short –
The fish arrived healthy and are active in the tank. I’m keeping them in a group of four. They seem to be adjusting well, though they do chase each other occasionally. Feeding them twice a day works fine.