Moderate
Halfmoon Mustard Male Betta (Betta splendens)
26–28°C · pH 6–8 · 41L
£37.99
A striking long-finned male betta with bold bicolor patterning and oversized pectoral fins, prized for its beauty and personality. Moderate care, aggressive. 24-30C, pH 6.0-7.5.
Care at a Glance
Scientific Name
Betta splendens
Max Adult Size
6–7 cm
Lifespan
3 years
Care Level
Moderate
Temperament
Aggressive
Temperature
24–30°C
pH Range
6–7.5
Hardness
1–15 dGH
Minimum Tank
25L
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
6–7.5
6Ideal7.5
Water Hardness
1–15 dGH
1 dGHIdeal15 dGH
Betta splendens
Betta spl. male halfmoon bicolor big ears - Betta Fish for Sale UK
Moderate Care
Aggressive
£29.99Sold 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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A striking long-finned male betta with bold bicolor patterning and oversized pectoral fins, prized for its beauty and personality. Moderate care, aggressive. 24-30C, pH 6.0-7.5.
Care at a Glance
Scientific Name
Betta splendens
Max Adult Size
6–7 cm
Lifespan
3 years
Care Level
Moderate
Temperament
Aggressive
Temperature
24–30°C
pH Range
6–7.5
Hardness
1–15 dGH
Minimum Tank
25L
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
6–7.5
6Ideal7.5
Water Hardness
1–15 dGH
1 dGHIdeal15 dGH
Three show traits meet on this one male: the halfmoon's 180-degree tail, a clean two-colour bicolor split between body and fins, and the oversized big ear pectorals that fan either side of the head as he swims. At 6–7 cm he carries a lot of genetics for one fish, and the combined effect in open water is constant motion — tail spread behind, pectorals working like paddles in front.
Owning him means accepting a fighter's rulebook. The record grades him aggressive with moderate care needs, recommending peaceful snails as company, peaceful shrimp only under careful monitoring, and very carefully selected peaceful tank mates solely in larger aquariums. It bars other male bettas, fin-nipping fish, aggressive or highly territorial species, fast boisterous tank mates that stress him, and fish with similar body shapes or long flowing fins that read as rivals. He settles from 25 litres upward, with water held between 24 and 30 °C, pH 6.0–7.5 and hardness from 1 to 15 dGH. All that finnage prefers gentle flow and surface resting spots, and his territorial drive rises when breeding condition develops. He is a top-region fish through and through.
Three traits mean three things to maintain, and diet carries most of the load: a varied carnivore menu keeps the halfmoon spread full, the bicolor boundary crisp and the big-ear pectorals — which never stop moving — fuelled. His 25-litre minimum wants the gentle-flow treatment owed to any heavily finned male, plus surface resting points he will use between patrols. Temperature can sit anywhere in 24–30 °C provided it stays put; pH 6.0–7.5 and 1–15 dGH cover the chemistry. Watch the pectorals as your condition gauge — steady fanning is his baseline, and any change there shows before the larger fins react. Kept singly as his record advises, he is a complete display in one fish.
Bicolor big ears halfmoon specs
- Length 6–7 cm
- ~3-year lifespan
- Moderate care
- Aggressive temperament
- 24–30 °C heat
- pH 6.0–7.5
- dGH 1–15
- 25 litres minimum
- Carnivorous diet
- Upper-level swimmer
For the collector
Triple-trait males of this quality rarely sit in stock for long — the bicolor big ear halfmoon combination is among the most requested we carry. Insulated UK despatch with a licensed live-animal courier; live arrival guaranteed.
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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