Bleheri Rainbowfish

About the Bleher's Rainbowfish

The Bleher's Rainbowfish is one of the most spectacular rainbowfish species available, admired for its shimmering blue body, fiery orange to red fins, and graceful flowing finnage. Native to the clear rainforest streams of Papua New Guinea, this active schooling fish is highly sought after for its brilliant colours and peaceful nature.

As they mature, males develop elongated dorsal and anal fins along with intense iridescent blue scales that contrast beautifully with their bright orange, yellow, and red finnage. During courtship, dominant males display incredible colours, making them a true centrepiece in any freshwater aquarium.

Bleher's Rainbowfish are highly active swimmers and should always be kept in schools of at least six, although groups of eight or more produce the best natural behaviour and colour displays. They thrive in heavily planted aquariums with open swimming areas, driftwood, and excellent water quality. A varied diet of premium flakes, micro pellets, frozen bloodworms, brine shrimp, daphnia, and live foods will maximise their colouration and overall health.

Hardy, peaceful, and constantly active, the Bleher's Rainbowfish is an outstanding addition to larger planted aquariums and peaceful community tanks.

Quick Care Guide

Scientific Name

Chilatherina bleheri

Common Name

Bleher's Rainbowfish

Origin

Papua New Guinea

Adult Size

10–12 cm

Temperament

Peaceful

Diet

Omnivore

Minimum Tank Size

150 Litres

Temperature

24–30°C

pH

6.5–8.0

Water Hardness

5–20 dGH

Difficulty

Beginner to Intermediate

Lifespan

5–8 Years

Suitable For

Planted aquariums and peaceful community tanks

Frequently Asked Questions

How many Bleher's Rainbowfish should I keep?

Bleher's Rainbowfish are schooling fish and should be kept in groups of at least six. Larger groups encourage natural behaviour and enhance male colouration.

Are Bleher's Rainbowfish aggressive?

No. They are peaceful fish that coexist well with other rainbowfish, tetras, Corydoras, gouramis, and other non-aggressive community species.

What do Bleher's Rainbowfish eat?

They thrive on quality flakes, micro pellets, frozen bloodworms, brine shrimp, daphnia, mosquito larvae, and other protein-rich foods.

Can Bleher's Rainbowfish live with shrimp?

Yes. Adult shrimp are generally safe, although very small shrimplets may occasionally be eaten.

Why aren't my Bleher's Rainbowfish colourful?

Males develop their brightest colours when kept in groups, provided with excellent water quality, quality nutrition, and a well-planted aquarium.

Common Mistakes

Keeping them in small groups

Bleher's Rainbowfish are schooling fish and display their best colours and behaviour in groups of six or more.

Providing too little swimming space

These active fish require long aquariums with plenty of open water for swimming.

Poor water quality

Regular water changes and efficient filtration are essential for maintaining vibrant colours and good health.

Feeding an unbalanced diet

A varied diet rich in quality protein helps maximise colouration and breeding condition.

Keeping them with aggressive fish

Choose peaceful tank mates that won't stress or outcompete these active rainbowfish.