Species Overview

The Macrostoma Male (IB109) (Betta macrostoma) is a rare wild betta native to Borneo, Indonesia. This particular locality, known as “Spade Tail,” is prized for its distinct tail shape, natural coloration, and preservation of wild genetics. Unlike ornamental bettas, Macrostoma retains its wild behavior, compact body form, and authentic fin structure, making it highly sought-after by collectors.

It is ideal for blackwater or softwater aquariums with biotope-style aquascaping.

🌟Appearance & Coloration

Unique spade-shaped tail, distinguishing it from other Macrostoma strains

Deep red to reddish-brown body coloration

Subtle iridescent highlights along fins and body

Rounded fins and streamlined wild-type body

Adult size: 4–6 cm

Color intensity enhanced in soft, slightly acidic blackwater conditions

This combination of tail shape and vivid coloration makes it a true centerpiece for planted or blackwater setups.

🌟Temperament & Behavior

Peaceful overall, 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 plants

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 recommended (sponge filter preferred)

Low water flow to mimic natural blackwater habitats

Dense plants, driftwood, and leaf litter for hiding spots

Secure lid required (bettas are jumpers)

🌟Water Conditions

Temperature: 24–28°C (75–82°F)

pH: 4.5–6.5

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 color intensity.

🌟Aquascaping Recommendations

Dark substrate enhances natural coloration

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

Floating plants provide shaded areas to reduce stress

Dense planting encourages natural behavior and breeding

🌟Feeding Habit & Diet

Macrostoma Male is carnivorous:

Live or frozen brine shrimp

Daphnia

Bloodworms (moderation)

High-quality micro pellets for bettas

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

🌟Tank Mates & Compatibility

Best kept in species-only tanks

Can coexist with small, peaceful softwater fish in heavily planted tanks

Avoid aggressive, large, or fin-nipping species

Male territoriality increases during breeding

🌟Breeding Information

Male is a paternal mouthbrooder

Eggs incubate in male’s mouth for 10–14 days

Soft, acidic water increases breeding success

Fry require infusoria or microworms in early stages

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

🌟Care & Maintenance

Intermediate care level

Maintain stable water and soft, slightly acidic conditions

Monitor water quality regularly

Provide shaded hiding areas to reduce stress

🌟Ideal For

Wild betta collectors

Blackwater aquarium enthusiasts

Nano aquarium hobbyists

Breeders focused on preserving authentic wild genetics

🌟Why Choose Macrostoma Male (IB109) “Spade Tail”?

This rare wild betta features a unique spade-shaped tail, vivid natural coloration, and authentic wild genetics. With softwater care, gentle filtration, and blackwater-style aquascaping, it becomes a stunning centerpiece for any collector aquarium.