Easy
Super Delta Tail Fighting Fish Female (Betta spl. female SuperDelta mix)
24–30°C · pH 6–7.5 · 20L
£10.99
Halfmoon Koi female betta, ~6.5 cm with one-off marbled koi blocks that shift over time. 24–28°C, pH 6.0–7.5, 20 L+.
Adult size is the maximum length this species reaches at full maturity (scientific sources). The livestock you receive will be younger and smaller — pick a size variant above for the actual shipping size. Photos are AI-enhanced, so the animal may show subtle colour or marking differences.
Betta spl. female Halfmoon Koi
Halfmoon Koi female betta, ~6.5 cm with one-off marbled koi blocks that shift over time. 24–28°C, pH 6.0–7.5, 20 L+.
Adult size is the maximum length this species reaches at full maturity (scientific sources). The livestock you receive will be younger and smaller — pick a size variant above for the actual shipping size. Photos are AI-enhanced, so the animal may show subtle colour or marking differences.
The betta fish is one of the most popular and most misunderstood freshwater species. This guide covers everything from proper tank size to the truth about tank mates.
Maintain these water conditions for optimal health and vibrant colors
Koi marbling never repeats itself, and that is the whole attraction of this Halfmoon Koi female: blocks of contrasting colour scattered koi-fashion across a 6.5 cm fish carrying the broad Halfmoon-type tail. The marble gene keeps working throughout her life, so the pattern she arrives with will drift and redistribute over the months — owning one is owning a slow-motion colour change.
She is rated moderate care and semi-aggressive, with a compatibility file that allows a little more than the strict fighters: snails are reliable, peaceful shrimp may be workable in heavily planted tanks though they can be hunted, and very carefully chosen peaceful bottom-dwellers can join her — but only in larger, well-structured tanks. Refuse other bettas, fin-nipping fish, aggressive or highly territorial species, large predators, and fast boisterous tank mates that stress her. Housing starts at 20 litres with water at 24–28 °C, pH 6.0–7.5 and hardness 1–15 dGH; she patrols the upper region and may turn territorial as breeding condition develops. Feed a carnivore diet and the colour blocks stay rich.
Marble-gene fish are bought twice: once for the pattern in the listing and again, gradually, for every pattern that follows. Support the show with stable basics — 20 litres minimum, 24–28 °C held firmly, carnivore feeding, water inside pH 6.0–7.5 and 1–15 dGH — because colour change is normal for the koi line but fading is not, and stable water is how you tell the difference. A monthly photo habit settles the question instantly. Her cautious community options follow the usual sequencing rule: established tank first, her last, larger volume than the minimum. Most koi females end up as cherished single specimens, their evolving blocks of colour doing the work a whole community usually does.
Because marbling is individual and ongoing, your female's pattern is hers alone and will keep evolving after arrival — no stock photo can promise otherwise, and we do not pretend it can. UK despatch by licensed live-animal courier with live arrival guaranteed.
24–30°C · pH 6–7.5 · 20L
24–30°C · pH 6–7.5 · 20L
24–30°C · pH 6–7.5 · 20L
24–30°C · pH 6–7.5 · 20L
24–30°C · pH 6–7.5 · 20L
24–28°C · pH 6–7.5 · 40L
18–26°C · pH 6.5–8 · 30L
23–27°C · pH 7.4–8.4 · 500L
20–27°C · pH 6–7 · 54L
23–27°C · pH 7.4–8.4 · 150L
24–28°C · pH 6.5–7.8 · 300L
20–24°C · pH 7–8 · 45L
24–28°C · pH 6.5–7.5 · 2000L
24–28°C · pH 7.5–8.5 · 200L
24–28°C · pH 5.5–7 · 60L
18–25°C · pH 6–8 · 100L
24–28°C · pH 7–8 · 120L
18–28°C · pH 6.5–8 · 20L
24–27°C · pH 7.5–8.8 · 150L
22–26°C · pH 6–7.5 · 60L
24–28°C · pH 7.5–8.5 · 40L
24–28°C · pH 7.5–8.5 · 500L