Betta macrostoma Captive Bred Unsexed Solo 1.5–2 Inches for Sale in Canada

The Betta macrostoma, commonly known as the Brunei Beauty Betta, is one of the most sought-after and spectacular species in the betta hobby. This rare freshwater fish is famous for its impressive adult size, powerful build, extraordinary orange-red coloration, dark markings, and distinctive display behaviour.

This listing is for a captive bred, unsexed, solo Betta macrostoma measuring approximately 1.5–2 inches. Because the fish is offered unsexed, the exact sex is not guaranteed. Each specimen is sold as an individual fish, making this an excellent choice for hobbyists interested in keeping this remarkable species in a carefully planned specialist aquarium.

Captive-bred specimens can offer an excellent opportunity for dedicated aquarists to keep and observe one of the hobby’s most iconic wild-type betta species. However, Betta macrostoma is not an ordinary community betta. It requires stable water conditions, appropriate environmental parameters, a secure aquarium, and thoughtful long-term care.

Monster Aquarium Canada offers captive bred Betta macrostoma for experienced aquarium hobbyists across Canada.

Why Choose Betta macrostoma?

One of the Most Spectacular Wild-Type Bettas

Betta macrostoma is admired for its combination of rarity, size, and exceptional appearance.

Key Features

• Captive bred specimen
• Sold individually as a solo fish
• Unsexed specimen
• Approximately 1.5–2 inches
• Rare and highly sought-after betta species
• Impressive adult size for a betta
• Striking orange-red and dark coloration
• Fascinating display behaviour
• Mouthbrooding reproductive behaviour
• Exceptional specialist aquarium fish

Colour and pattern can vary depending on age, sex, genetics, health, diet, mood, and aquarium conditions.

Size Offered: Approximately 1.5–2 Inches

This listing is for an individual Betta macrostoma measuring approximately 1.5–2 inches.

The fish is offered:

• Captive bred
• Unsexed
• Solo / sold individually

At this size, determining sex can be difficult or unreliable. Buyers should not assume that an individual specimen is male or female unless specifically stated.

How Large Does Betta macrostoma Grow?

A Large and Powerful Betta

Adult Betta macrostoma can reach approximately 4–5 inches (10–12 cm), making it significantly larger than many common aquarium betta species.

Males may develop particularly dramatic finnage and coloration, but appearance varies between individual fish.

Before purchasing, plan for the adult fish and provide sufficient space, filtration, and appropriate environmental conditions.

Aquarium Size and Setup

A Specialist Species Requires a Carefully Planned Aquarium

A 20-gallon aquarium or larger is recommended for a single adult, while a larger aquarium may be required for pairs or carefully planned groups.

Betta macrostoma appreciates a secure, calm environment.

Recommended Aquarium Setup

• Mature biological filtration
• Stable, exceptionally clean water
• Gentle water movement
• Driftwood
• Leaf litter
• Indian almond leaves or other suitable botanical materials
• Dense planting where appropriate
• Floating plants
• Sheltered areas
• Dim or subdued lighting
• A completely secure tight-fitting lid

A secure lid is extremely important because Betta macrostoma can jump.

Water Parameters

Stable Conditions Are Essential

• Scientific Name: Betta macrostoma
• Common Name: Betta macrostoma, Brunei Beauty Betta
• Origin: Borneo
• Size Offered: Approximately 1.5–2 inches
• Potential Adult Size: Approximately 4–5 inches (10–12 cm)
• Temperature: Approximately 24–28°C (75–82°F)
• pH: Approximately 5.5–7.0
• Water Hardness: Generally soft water preferred
• Care Level: Advanced
• Temperament: Can be territorial
• Diet: Carnivorous
• Lifespan: Often several years with excellent care

For sensitive specialist species, stability is more important than making frequent dramatic adjustments to chase an exact water parameter.

What Does Betta macrostoma Eat?

A Carnivorous Diet

Betta macrostoma benefits from a varied diet of high-quality, appropriately sized protein-rich foods.

Recommended Foods

• High-quality betta or carnivore pellets, where accepted
• Frozen brine shrimp
• Frozen mysis shrimp
• Daphnia
• Bloodworms in moderation
• Small insects and insect-based foods
• Other suitable aquatic invertebrate foods

Feed a varied diet while avoiding excessive feeding and maintaining excellent water quality.

Behaviour and Temperament

Beautiful but Not an Ordinary Community Fish

Betta macrostoma can show strong personality and territorial behaviour. Individual temperament varies, particularly as fish mature.

They may:

• Establish preferred territories
• Display to other fish
• Flare and show dramatic coloration
• Defend their personal space
• Become stressed by overly active tank mates
• Jump when startled

For these reasons, a species-focused aquarium is often the safest choice for a single specimen.

Compatible Tank Mates

Careful Planning Is Essential

A solo Betta macrostoma is often best kept alone in a dedicated aquarium, particularly when the fish is being grown and its individual temperament is still unknown.

Potential tank mates, where appropriate, must be peaceful and compatible with the same water conditions.

Avoid

• Aggressive cichlids
• Fin-nipping fish
• Large predatory fish
• Highly active or boisterous species
• Fish that require significantly different water conditions
• Other territorial fish without adequate space

Never add tank mates simply because they are small. Consider behaviour, water requirements, feeding competition, and stress.

Betta macrostoma and Blackwater Aquariums

Create a Natural-Looking Specialist Setup

A carefully designed blackwater-style aquarium can provide an attractive environment for Betta macrostoma.

Consider:

• Natural driftwood
• Leaf litter
• Botanical materials suitable for aquarium use
• Floating plants
• Gentle filtration
• Low to moderate lighting
• Calm areas near the surface

Tannins may naturally colour the water, but water chemistry should always be monitored rather than assuming that dark water automatically creates suitable conditions.

Breeding Betta macrostoma

A Fascinating Mouthbrooding Betta

Betta macrostoma is a paternal mouthbrooder. Following spawning, the male carries and incubates the developing eggs in his mouth.

Breeding this species requires:

• Correctly sexed, compatible adults
• Stable environmental conditions
• Excellent nutrition
• Low stress
• Appropriate space
• Careful observation

Because this listing is for an unsexed solo specimen, it should not be purchased with the expectation of immediately forming a breeding pair.

Why Buy Captive Bred Betta macrostoma from Monster Aquarium Canada?

Rare Specialist Bettas for Canadian Aquarists

Monster Aquarium Canada offers unusual freshwater fish for hobbyists interested in rare bettas, wild-type bettas, specialist species, nano and planted aquarium fish, and other exceptional freshwater animals.

Captive Bred and Sold Individually

This listing offers a captive bred Betta macrostoma approximately 1.5–2 inches, sold individually and unsexed.

Captive-bred fish can be an appealing option for aquarists seeking responsibly produced specialist aquarium fish.

Before ordering, ensure your aquarium is mature, secure, and suitable for the long-term care of this rare species.

Frequently Asked Questions

1. How big is this Betta macrostoma?

This listing is for a fish measuring approximately 1.5–2 inches.

2. Is this Betta macrostoma male or female?

The fish is sold unsexed, so the sex is not guaranteed.

3. How large does Betta macrostoma grow?

Adults can reach approximately 4–5 inches (10–12 cm).

4. Is Betta macrostoma suitable for beginners?

It is generally better suited to experienced aquarists because of its specialist care requirements and need for stable conditions.

5. Why does the aquarium need a tight-fitting lid?

Betta macrostoma can jump, particularly when startled. A secure lid is important to prevent escape.