Betta albimarginata 3–5cm
Betta albimarginata, often called the White-Seam Betta, is a small wild Betta from East Kalimantan, Borneo. Displaying males develop striking red to brick-red colouration contrasted by dark bands and distinctive white fin margins. Unlike the familiar domestic Betta, this species is a paternal mouthbrooder and is best suited to aquarists wanting to keep wild Bettas in a carefully prepared aquarium.
Quick Facts
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Scientific name: Betta albimarginata
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Common name: White-Seam Betta / Whiteseam Fighter
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Sale size: Approximately 3–5cm
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Adult size: Approximately 3cm standard length
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Origin: Sebuku River drainage, East Kalimantan, Indonesian Borneo
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Temperature: 23–28°C
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pH: 4.0–6.5
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Hardness: Very soft water, approximately 1–5 dGH
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Temperament: Relatively peaceful but shy
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Diet: Carnivorous micropredator
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Breeding: Paternal mouthbrooder
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Difficulty: Intermediate
Is this for you?
Perfect if:
- You want to explore wild Bettas beyond domestic Betta splendens.
- You can provide genuinely soft, acidic and stable water.
- You enjoy natural-style aquariums with leaf litter, plants, wood and shaded areas.
- You are interested in unusual Betta behaviour and paternal mouthbrooding.
Consider something else if:
- Your aquarium has hard or alkaline water that you are unable to modify reliably.
- You want a Betta for a busy general community aquarium.
- Your aquarium contains large, aggressive or highly competitive feeders.
- You are looking for a fish that can simply be added to almost any tap-water setup.
Why choose Betta albimarginata?
This is a genuinely distinctive wild Betta. Its small adult size, contrasting white-edged fins and fascinating breeding behaviour make it particularly rewarding for aquarists interested in species-focused setups rather than conventional community fishkeeping.
The male's role as a mouthbrooder is especially interesting: after spawning, he carries the developing brood in his mouth until the fry are ready to be released.
Key Benefits
- Small wild Betta suitable for carefully planned nano and species aquariums.
- Beautiful white-edged fin patterning, particularly prominent in displaying males.
- Interesting pair and group interactions when appropriately housed.
- Fascinating paternal mouthbrooding reproductive behaviour.
- Excellent choice for aquarists wanting to progress into specialist wild Betta keeping.
Care & Specifications
Betta albimarginata naturally occurs in shallow forest streams among plant roots, marginal vegetation and leaf litter.
Aquariums should provide plenty of shelter using driftwood, plants, caves and leaf litter. Subdued lighting and floating plants can help create the shaded environment these fish prefer.
Filtration should be gentle. Strong currents and very exposed aquariums are best avoided.
Soft, acidic water is an important part of keeping this species successfully. Stability matters more than continually chasing an exact number.
A tightly fitting lid is essential. Wild Bettas are capable jumpers and should also have access to warm, humid air immediately above the water surface.
What will you receive?
You will receive healthy Betta albimarginata selected from our available livestock at approximately the sale size stated on this listing.
Colour, markings, body shape and exact size naturally vary between individual fish. Juveniles and unstimulated fish may also display less intense colour than mature males in breeding or display condition.
Acclimation & Introduction
Prepare the aquarium before your fish arrives and ensure temperature and water chemistry are stable.
Because this species prefers very soft, acidic conditions, avoid suddenly transferring fish between substantially different water parameters. Acclimate carefully and minimise unnecessary handling and stress.
Introduce the fish into a mature aquarium with plenty of cover rather than a bright, exposed environment.
Ongoing Care
Offer a varied carnivorous diet. Small live and frozen foods such as Artemia, Daphnia and appropriately sized bloodworms are particularly useful. Quality prepared foods may also be accepted once recognised as food.
Feed sensible portions rather than heavily feeding in a single sitting.
Maintain excellent water quality through regular, appropriately sized water changes while avoiding sudden changes in temperature or water chemistry.
Pairs perfectly with
- Botanical and leaf-litter aquariums
- Driftwood and natural hiding structures
- Cryptocoryne and other plants suited to subdued lighting
- Floating plants for additional shade and security
- Gentle sponge filtration
- Foods such as Artemia, Daphnia and other appropriately sized frozen or live foods
NTA Insight:
Don't treat Betta albimarginata as simply a smaller version of a domestic Siamese Fighting Fish. The biggest difference is not its appearance — it is the aquarium you build around it. Soft water, plenty of cover, subdued lighting, gentle filtration and suitable food will give you a much better chance of seeing the natural colour and behaviour that make this species special.
Before You Buy
This is a specialist wild Betta rather than a general-purpose community fish.
Check your source-water hardness and pH before purchasing. If your water is naturally hard and alkaline, you may need an appropriate method of producing and remineralising softer water rather than relying on chemical pH adjustment alone.
A secure aquarium lid is strongly recommended.
Always consider the temperament and environmental requirements of existing livestock before introducing new fish.
FAQ
Is Betta albimarginata the same as a normal Siamese Fighting Fish?
No. It is a separate wild Betta species with different environmental requirements and behaviour.
Can I keep Betta albimarginata in a community aquarium?
It is generally better suited to a species-focused aquarium or carefully selected peaceful companions. Large, aggressive or very active fish can intimidate it or outcompete it for food.
Does Betta albimarginata need soft water?
Yes. This species is naturally associated with very soft, acidic water, and this should be considered a core husbandry requirement rather than an optional preference.
What should I feed them?
A varied carnivorous diet is recommended. Small live and frozen foods such as Artemia and Daphnia are excellent options, supplemented with suitable quality prepared foods where accepted.
Are they mouthbrooders?
Yes. Betta albimarginata is a paternal mouthbrooder. The male carries the developing brood in his mouth before releasing free-swimming fry.
Can they jump?
Yes. Keep the aquarium securely covered and avoid gaps around lids, cables and filtration equipment.
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