Species Overview

The Macrostoma Male (IB133) (Betta macrostoma) is a rare wild betta species native to the peat swamps of Borneo, Indonesia. This locality strain is highly prized among collectors for its natural vivid coloration, compact body, and preservation of authentic wild genetics. Unlike ornamental bettas, Macrostoma retains its wild behavior and streamlined body form, making it a true collector’s fish.

It is ideal for aquarists seeking a striking, rare betta for blackwater or softwater aquariums with biotope-style setups.

🌟Appearance & Coloration

Vivid body coloration, ranging from deep red to bronze depending on water conditions

Subtle iridescent highlights along the scales and fins under proper lighting

Rounded fins and natural wild-type body shape

Adult size: 4–6 cm

Color intensity is enhanced in soft, acidic blackwater conditions

The striking coloration and compact size make this species a beautiful centerpiece in planted or blackwater aquariums.

🌟Temperament & Behavior

Peaceful in general, but males are territorial during breeding

Male is a paternal mouthbrooder, carrying eggs until fry hatch

Active mid- to lower-water swimmer

Prefers shaded areas, driftwood, and dense plant cover

Best kept in species-only tanks or with carefully selected, peaceful tank mates

🌟Tank Requirements

Minimum tank size: 20–30 liters (5–8 gallons) for a single fish

Gentle filtration (sponge filter recommended)

Low water flow to mimic slow-moving blackwater streams

Dense plants, leaf litter, and driftwood for natural hiding spaces

Secure lid is essential as bettas are jumpers

🌟Water Conditions

Temperature: 24–28°C (75–82°F)

pH: 4.5–6.5

Water Hardness: Very soft to soft

Ammonia/Nitrite: 0 ppm

Nitrate: <20 ppm

Regular small water changes (10–20% weekly) help maintain optimal water quality and prevent stress.

🌟Aquascaping Recommendations

Dark substrate to enhance natural coloration

Driftwood, leaf litter, and Indian almond leaves to create tannin-rich blackwater

Floating plants to provide shade and reduce stress

Dense planting encourages natural behavior and territorial boundaries

A blackwater-inspired aquascape will maximize both color and wellbeing.

🌟Feeding Habit & Diet

Macrostoma Male is carnivorous and thrives on protein-rich foods:

Live or frozen brine shrimp

Daphnia

Bloodworms (in moderation)

High-quality micro pellets for bettas

Feed small portions 1–2 times daily. Remove uneaten food to maintain water quality.

🌟Tank Mates & Compatibility

Best kept in a species-only tank

Can coexist with small, peaceful fish tolerant of softwater conditions in larger tanks

Avoid aggressive or fin-nipping species

Male territoriality increases during breeding

🌟Breeding Information

Paternal mouthbrooder

Male incubates eggs for approximately 10–14 days

Soft, acidic water increases breeding success

Fry require infusoria or microworms during early development

Breeding this species preserves wild genetics and is rewarding for experienced aquarists.

🌟Care & Maintenance

Intermediate care level

Maintain stable water parameters and soft, slightly acidic water

Monitor water quality regularly

Provide shaded hiding areas to reduce stress

🌟Ideal For

Wild betta collectors

Blackwater aquarium hobbyists

Nano tank enthusiasts

Breeders looking to maintain authentic wild genetics

🌟Why Choose Macrostoma Male (IB133)?

This rare wild betta features natural, vibrant coloration, peaceful yet fascinating behavior, and authentic wild genetics. With softwater care, gentle filtration, and a blackwater-inspired setup, it becomes a stunning centerpiece for any home or collector aquarium.