Species Overview

The Macrostoma Male (IB111) (Betta macrostoma) is one of the most prestigious and sought-after wild betta species in the aquarium hobby. Native to the blackwater streams of Borneo, this species is treasured by collectors for its rarity, natural elegance, and fascinating breeding behavior.

Unlike ornamental domestic bettas, Macrostoma retains its authentic wild form, refined structure, and calm yet confident temperament. IB111 represents a specific collection line, maintaining pure genetics and traceability—ideal for serious breeders and enthusiasts.

🌟Appearance & Natural Coloration

Deep earthy red to reddish-brown body tones

Subtle darker banding along the body

Streamlined wild-type fin structure

Elegant rounded caudal fin

Adult size: approximately 4–6 cm

Under soft, tannin-rich lighting, the natural red hues intensify beautifully, especially in blackwater setups.

🌟Temperament & Behavior

Generally peaceful and calm

Males may display territorial behavior during breeding

Active mid- to lower-level swimmer

Prefers shaded, structured environments

Exhibits fascinating paternal mouthbrooding behavior

This species thrives in quiet tanks with minimal disturbance and stable water parameters.

🌟Tank Requirements

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

Gentle sponge filtration recommended

Very low water flow

Secure lid required (excellent jumper)

Dim lighting preferred

Add driftwood, botanicals, and leaf litter to recreate natural habitat conditions.

🌟Water Conditions (Very Important for Macrostoma)

Temperature: 24–28°C (75–82°F)

pH: 4.5–6.5 (slightly acidic ideal)

Hardness: Very soft to soft

Ammonia/Nitrite: 0 ppm

Nitrate: Below 20 ppm

Stable soft, acidic water is key to maintaining health and coloration. Regular small water changes (10–20% weekly) are recommended.

🌟Aquascaping Recommendations

Blackwater-style setup preferred

Indian almond leaves or natural botanicals

Driftwood with tannins

Floating plants to diffuse light

Dark substrate to enhance color

Creating a biotope-style tank significantly reduces stress and enhances natural behavior.

🌟Feeding Habit & Diet

Macrostoma Male is strictly carnivorous and prefers:

Live brine shrimp

Daphnia

Mosquito larvae

Frozen bloodworms (occasionally)

High-quality carnivore micro pellets

Feed small portions once or twice daily. Remove uneaten food promptly to protect water quality.

🌟Tank Mates & Compatibility

Best kept in species-only aquarium

Can coexist with very peaceful softwater fish in larger planted setups

Avoid aggressive or fast-swimming species

Avoid fin nippers

This species is best appreciated in a calm, dedicated environment.

🌟Breeding Information

Paternal mouthbrooder

Male incubates eggs in mouth for approximately 10–14 days

Soft, acidic water encourages successful breeding

Fry require live micro foods in early stages

Breeding Macrostoma is rewarding but recommended for experienced aquarists.

🌟Care Level

Intermediate to advanced

Sensitive to water hardness and parameter fluctuations

Requires stable, mature aquarium

Not recommended for beginners without softwater experience

🌟Why Choose Macrostoma Male (IB111)?

This is not just a fish—it’s a collector’s species. Macrostoma Male (IB111) offers authentic wild genetics, rare availability, and fascinating mouthbrooding behavior. With proper softwater care and a blackwater-inspired setup, it becomes a true centerpiece for serious aquarists.