Rainbow Shark

Overview

Rainbow Shark (Epalzeorhynchos frenatum) is a bottom-dwelling fish for aquariums where the layout leaves enough open substrate area and the water stays stable.

Use these values as planning checks, then make sure the aquarium still has room for behavior, group needs, and calm community fish.

Care requirements

With a Beginner care level, Rainbow Shark is approachable, but it still needs stable water, clean substrate, and a well-planned stocking group.

Because it uses the bottom area, leave enough open substrate area instead of crowding that part of the aquarium.

With a lifespan of up to 8 years, this is a fish to plan for long term rather than an impulse addition.

Aquarium size and space needs

An aquarium of 200 L or larger can be a reasonable starting point, but it should not be read as permission to overstock.

At up to 15 cm, Rainbow Shark stays small, but it still needs room to move, feed, and avoid constant competition.

Uses the bottom area, so leave enough open substrate area for movement and feeding.

Water parameters

The temperature range for this fish is 22 to 27 °C, which fits many tropical freshwater aquariums. Choose other fish with overlapping temperature needs.

The pH range for this fish is 6.5 to 7.5. That points to slightly acidic to neutral water, but stability is more important than sudden corrections.

The GH range for this fish is 10 to 16 dGH. That gives some flexibility, but sudden changes are usually more stressful than a stable value that is slightly imperfect.

The KH range is 1 to 10 dKH. Use it as a general stability reference rather than a reason for aggressive adjustments.

Temperament and compatibility

Rainbow Shark needs more careful companion choice because the temperament data suggests space, boundaries, or similar-sized fish may matter.

Because this fish uses the bottom area, compatibility is easier when other fish are not all competing for the same swimming space.

Swimming zone and behavior

This fish uses the bottom area, so leave enough open substrate area for movement and feeding.

Feeding

As an omnivore, Rainbow Shark should receive a varied diet rather than one repeated food type.

Because it feeds near the bottom, make sure food reaches the substrate and is not completely taken by faster fish in the open water.

Natural habitat and origin

This profile currently lists the origin as Thailand Malaysia Laos Myanmar. Treat this as a broad regional note rather than a complete habitat description.

Before adding this fish

Use this checklist before treating the profile as a match for an existing aquarium.

• Plan for an aquarium of 200 L or larger.
• Make sure the bottom area has enough open substrate for a group.
• Choose other fish with overlapping temperature needs.
• Keep pH stable within the listed range instead of making sudden corrections.
• Choose other fish carefully around this temperament.
• Offer a varied diet suitable for an omnivorous bottom-dwelling fish.