Moderate
Halfmoon Koi Female Betta (Betta splendens)
26–28°C · pH 6–8
£24.99
Wild emerald-type female smaragdina betta with natural green sheen for a planted tank. Moderate care, semi-aggressive. 24–28°C, pH 6.0–7.5.
Care at a Glance
Scientific Name
Betta smaragdina
Max Adult Size
up to 6.5 cm
Lifespan
3 years
Care Level
Moderate
Temperament
Semi-aggressive
Temperature
24–28°C
pH Range
6–7.5
Hardness
1–10 dGH
Minimum Tank
20L
Diet
Insectivore
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
24–28°C
24°CIdeal28°C
pH Level
6–7.5
6Ideal7.5
Water Hardness
1–10 dGH
1 dGHIdeal10 dGH
Betta smaragdina
Betta spl. female Wild Smaragdina Guitar - Betta Fish for Sale UK
Moderate Care
Semi-Aggressive
£36.99Sold 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 emerald-type female smaragdina betta with natural green sheen for a planted tank. Moderate care, semi-aggressive. 24–28°C, pH 6.0–7.5.
Care at a Glance
Scientific Name
Betta smaragdina
Max Adult Size
up to 6.5 cm
Lifespan
3 years
Care Level
Moderate
Temperament
Semi-aggressive
Temperature
24–28°C
pH Range
6–7.5
Hardness
1–10 dGH
Minimum Tank
20L
Diet
Insectivore
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
24–28°C
24°CIdeal28°C
pH Level
6–7.5
6Ideal7.5
Water Hardness
1–10 dGH
1 dGHIdeal10 dGH
Offered here as a female of the Wild Smaragdina "Guitar" line, this is a wild-type emerald betta that keeps the green sheen of the smaragdina group without the flowing finnage of fancy show strains. Females tend to be the steadier, slightly more sociable sex, which makes this a useful choice for keepers planning a thoughtfully stocked, well-planted aquarium.
Expect a top-dwelling labyrinth fish that reaches around 6.5 cm and lives for about three years. Its diet is insectivorous, so small live or frozen invertebrate foods suit it far better than a plant-based menu. Although described as semi-aggressive, a female in a generously sized, heavily planted tank is usually manageable when tankmates are picked with care.
A densely planted 20-litre aquarium (or larger) with plenty of broken sightlines gives this betta the security it wants. Keep the water soft to moderately hard and warm, and provide surface cover so it can rest near the top. Hardness from 1 to 10 dGH suits her, and a gently filtered tank that mimics quiet, slow-moving water is closer to her natural conditions than a high-flow setup.
A common question is how big this fish gets: females of this line grow to around 6.5 cm, a touch larger than many fancy bettas, so the planting and footprint should be scaled accordingly. With consistent feeding of small invertebrate foods and stable warmth, she should reach a typical age of about three years in good health.
Aquarium requirements
- Grows to about 6.5 cm; typically lives around 3 years
- Temperature 24–28°C, pH 6.0–7.5, hardness 1–10 dGH
- From 20 litres in a heavily planted layout; occupies the top zone
- Insectivore — small live and frozen foods preferred
- Semi-aggressive; can turn territorial in breeding condition
Choosing tankmates
Best results come from a planted tank shared with peaceful small fish such as small rasboras, plus peaceful snails, and shrimp only where this betta is not inclined to hunt them. Avoid other male bettas, fin-nipping or large boisterous fish, long-finned species, very small fry and any highly territorial neighbours. Every Wild Smaragdina Guitar female is shipped with a licensed live-animal courier and backed by 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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