Western Rainbowfish (Melanotaenia australis) – Tank Bred

Species Overview

The Western Rainbowfish is one of Australia's most iconic freshwater fish, prized for its shimmering coloration, active schooling behavior, and impressive adaptability. As adults mature, Western Rainbowfish develop vibrant combinations of blue, silver, gold, orange, and red tones that become even more striking when displayed in a large, healthy school.

In many aquariums, Western Rainbowfish serve as the centerpiece of the upper and middle water column. Their constant movement, social nature, and flashing colors bring energy to the aquarium while showcasing the beauty of schooling fish behavior. Males often display their brightest colors while interacting with one another, creating an ever-changing display of movement and color.

Despite their beauty, Western Rainbowfish are remarkably hardy and adaptable. Western Rainbowfish thrive in community aquariums with other peaceful species and are especially well suited for larger planted aquariums where they have plenty of swimming space. Their active nature makes them an excellent choice for hobbyists looking to create a dynamic and visually engaging freshwater ecosystem.

Whether you are building a colorful Australian-themed aquarium, a planted community display, or simply looking for a peaceful schooling fish with exceptional adult coloration, Western Rainbowfish are among the most rewarding Rainbowfish species available to freshwater hobbyists.

What We Love About This Fish

• Brilliant adult coloration that intensifies with age and proper care

• Active schooling behavior that brings movement to the aquarium

• Peaceful temperament and excellent community compatibility

• Hardy and adaptable for a wide range of freshwater aquariums

Quick Care Guide

Care Level: Easy

Temperament: Peaceful

Diet: Omnivore

Maximum Adult Size: 4–5 Inches

Minimum Tank Size: 55 Gallons

Swimming Zone: Middle to Upper Water Column

Schooling Requirement: Groups of 6 or More

Origin: Tank Bred

Approximate Purchase Size: 1.5–2.5 Inches

Tank Parameters

Temperature: 72°–82°F

pH: 6.8–8.2

GH: 8–20 dGH (140–350 ppm)

KH: 4–12 dKH

Minimum Aquarium Size: 55 Gallons

School Size: 6+ Fish Recommended

Swimming Zone: Middle to Upper Water Column