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The Betta Macrostoma, or Brunei Beauty, is a strikingly rare freshwater fish prized for its vibrant coloration and captivating behavior in aquariums.

Detailed Description

The Betta Macrostoma, commonly known as the Brunei Beauty, is a highly sought-after species among aquarium enthusiasts due to its vibrant orange-red coloration, black facial stripes, and unique personality. Native to the pristine waters of Brunei and northern Borneo, this species offers a rewarding experience for advanced hobbyists who appreciate its natural beauty and specific care requirements.

Key Features:

• Scientific Name: Betta macrostoma
• Common Names: Brunei Beauty, Spotfin Betta
• Adult Size: Up to 3.5 inches (9 cm)
• Lifespan: 4-6 years with proper care
• Temperament: Peaceful yet territorial during breeding

Water Conditions

Creating a stable and naturalistic environment is critical for Betta Macrostoma:

• Tank Size: Minimum 20 gallons for a pair, larger for community setups
• Water Temperature: 75°F–80°F (24°C–27°C)
• pH Level: Slightly acidic, 5.0–6.5
• Water Hardness: Soft water, 1–5 dGH
• Filtration: Gentle flow, as they inhabit calm waters in the wild
• Substrate and Decor: Provide a sand substrate with plenty of driftwood, leaf litter, and caves to mimic their natural habitat and create hiding spots.

Tip: Perform regular water changes (25% weekly) and use an Indian almond leaf to replicate tannin-rich water, beneficial for their health.

Tank Mates

While peaceful, Betta Macrostoma require carefully chosen tank mates due to their specific water conditions and territorial nature during breeding:

• Ideal Tank Mates: Small, non-aggressive species like Ember Tetras, Harlequin Rasboras, or small Corydoras species that thrive in similar water conditions.
• Species-Only Tanks: Preferred for breeding or for minimizing stress.
• Avoid: Large, aggressive, or fin-nipping fish, as well as overly active species that may disturb their calm demeanor.

Feeding Habits

Betta Macrostoma are carnivorous and prefer a diet that mimics their natural feeding habits.

• Preferred Foods:
  • Live or frozen foods such as brine shrimp, bloodworms, and daphnia.
  • Occasional offerings of small insects like mosquito larvae.
• Dietary Tips:
  • Feed small portions 2–3 times daily.
  • Supplement with high-quality carnivore pellets or freeze-dried options to ensure balanced nutrition.

Avoid overfeeding, as this can lead to poor water quality and health issues.

Care and Maintenance

Betta Macrostoma care requires attention to detail but is highly rewarding for dedicated aquarists:

• Behavior: Generally peaceful but can exhibit territorial behavior during breeding. Provide separate tanks or sections for breeding pairs.
• Breeding: A unique mouthbrooder, the male incubates eggs in his mouth for 10–14 days. Breeding success relies on stable water parameters and a calm environment.
• Health: Monitor for signs of stress or illness, such as faded coloration or lethargy, which often result from poor water conditions or diet.

Conclusion
The Betta Macrostoma is a show-stopping addition to any experienced aquarist’s collection, offering unparalleled beauty and intriguing behavior. With the right care and setup, these magnificent fish can thrive and even breed, providing a fascinating glimpse into one of nature's most captivating freshwater species.