Moderate
Halfmoon Mustard Male Betta (Betta splendens)
26–28°C · pH 6–8 · 41L
£37.99
Wild Mahachai male betta, a bold top-dwelling fighter best kept alone in a planted tank. Moderate care, aggressive. 24–30°C, pH 6.5–7.5.
Care at a Glance
Scientific Name
Betta mahachaiensis
Max Adult Size
up to 8 cm
Lifespan
3 years
Care Level
Moderate
Temperament
Aggressive
Temperature
24–30°C
pH Range
6.5–7.5
Hardness
2–12 dGH
Minimum Tank
50L
Diet
Carnivore
Adult size is the maximum length this species reaches at full maturity (scientific sources). The livestock you receive will be younger and smaller. Product-photo provenance and any image-specific limitations are stated on the listing.
Water Parameters
Temperature
24–30°C
24°CIdeal30°C
pH Level
6.5–7.5
6.5Ideal7.5
Water Hardness
2–12 dGH
2 dGHIdeal12 dGH
Betta mahachaiensis
Wild Betta Mahachaiensis Male (Betta mahachaiensis)
Moderate Care
Aggressive
£50.99Sold Out
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Live arrival guaranteed. If they don’t arrive healthy, email us a short unboxing video the same day for a replacement or refund. Packed in oxygenated bags with insulation and heat packs when needed.
£19.95 tracked delivery — half price (£9.98) from £100.00, free from £200.00. One delivery charge however many fish you add — everything travels together with a licensed live-animal courier.
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Wild Mahachai male betta, a bold top-dwelling fighter best kept alone in a planted tank. Moderate care, aggressive. 24–30°C, pH 6.5–7.5.
Care at a Glance
Scientific Name
Betta mahachaiensis
Max Adult Size
up to 8 cm
Lifespan
3 years
Care Level
Moderate
Temperament
Aggressive
Temperature
24–30°C
pH Range
6.5–7.5
Hardness
2–12 dGH
Minimum Tank
50L
Diet
Carnivore
Adult size is the maximum length this species reaches at full maturity (scientific sources). The livestock you receive will be younger and smaller. Product-photo provenance and any image-specific limitations are stated on the listing.
Full Care Guide
Betta Fish Care Guide: Siamese Fighting Fish
For one typical domestic Betta splendens, start with at least 20 litres, a mature filter, thermostatic heater, separate thermometer, gentle flow, a secure lid with surface access, and plants or refuges. Keep one male per aquarium.
13 min readRead guide
Water Parameters
Maintain these water conditions for optimal health and vibrant colors
Temperature
24–30°C
24°CIdeal30°C
pH Level
6.5–7.5
6.5Ideal7.5
Water Hardness
2–12 dGH
2 dGHIdeal12 dGH
Among the prized wild members of the Betta splendens complex, the male Mahachai betta (Betta mahachaiensis) is a true fighter rather than a long-finned ornamental form. It is a fish for the keeper who wants the character of a wild Thai betta and is prepared to give it a tank of its own.
This is the larger, bolder sex, reaching around 8 cm and carrying a distinctly aggressive temperament. It patrols the upper levels of the aquarium, breathes air at the surface through its labyrinth organ, and feeds as a carnivore, so a varied menu of meaty foods suits it best. A typical lifespan is about three years.
Give a single male at least 50 litres, planted heavily with plenty of cover, and keep the water warm and close to neutral. Strong structure and broken sightlines help diffuse its territorial drive. It accepts a hardness range of 2 to 12 dGH and a temperature band up to 30°C, which is at the warmer end for a betta and worth matching with a reliable heater.
People often ask whether a Mahachai male can live in a community tank: in practice it really cannot be trusted in a mixed setup, and a species arrangement is the responsible default for an aggressive wild fighter of this kind. Treated this way, with quiet conditions and a varied carnivorous diet, it typically lives for around three years.
Keeping a Mahachai male
- Reaches roughly 8 cm; lifespan around 3 years
- Temperature 24–30°C, pH 6.5–7.5, hardness 2–12 dGH
- Minimum 50 litres; a top-dwelling, moderate-care fish
- Carnivore — feed varied meaty foods
- Aggressive and territorial — one male per tank
Stocking advice
Because of that aggression, this male is safest essentially alone. Snails are a reliable companion, and only very peaceful, non-nippy bottom dwellers might be considered, and then only in a large, heavily planted tank with close monitoring. Never house it with other male bettas, fin-nipping fish, large or boisterous species, aggressive cichlids, or fish that demand very hard, alkaline water. Each Mahachai male is sent via a licensed live-animal courier with our live arrival guarantee.
Customer Reviews
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What customers say about ordering from us
4.6 on Google Maps, rated 4.6 out of 5 (opens in a new tab)4.4 · 91 shop reviews read them, rated 4.4 out of 5
- 4 out of 5Verified buyer
I have a small group of long finned mountain minnows. So was delighted to be able to order ten of this variety to increase the genetics in my tank . The ones I recieved are healthy but it’s to early to give a verdict on wether they are of a long finned type since they are small currently.
Gordon Walker · 23 Sept 2026
- 5 out of 5Verified buyer
100% success travel and "installation". Pleased with quality of purchase. The Siamese fighter a bit "shy" so have not yet seen him at his best yet but looking good. Happy customer. GG
George E Garratt · 21 Sept 2026
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