Betta spl. female Halfmoon Mustard - Betta Fish for Sale UK

Mustard colouring on a female Halfmoon is a quieter, subtler take on one of the hobby's flashiest male strains — the dark-into-yellow two-tone carried on a 6.5 cm female whose lighter finnage makes her faster and more manoeuvrable than her male counterparts. What she gives up in fin area she returns in activity: this is a fish that uses the whole top of the tank, all day.

Despite the softer look, her record reads best kept alone, or with very carefully chosen peaceful tank mates in larger tanks. Small peaceful snails are safe; shrimp can be attempted in larger, well-planted aquariums but may be eaten. Keep her away from other bettas, fin-nipping fish, aggressive or highly territorial species, large boisterous fish, and — notably — fish with a similar body shape or flowing fins, which her instincts flag as rivals. She is moderate care and semi-aggressive, needing a 38-litre minimum, water from 24 to 30 °C, pH 6.0–7.5 and hardness 1–15 dGH. Carnivore feeding keeps the mustard tones strong, and like all her species she can sharpen into territoriality when breeding condition arrives.

The 38-litre minimum is the headline requirement here, larger than most females in our range carry, and it pays for itself in activity: she is a mover, and the mustard gradient reads best on a fish with room to cross the tank in open water. Keep the heater anywhere inside 24–30 °C, run weekly maintenance to hold pH 6.0–7.5 and hardness 1–15 dGH, and feed her carnivore ration at the surface where she stations herself. Her record's caution about similar-shaped and flowing-finned tank mates is worth rereading before any stocking decision — it rules out more candidates than first appears. Kept singly with snails, she is a three-year fish of very few demands.

Mustard Halfmoon female: key facts

• Adult length about 6.5 cm
• Typical lifespan 3 years
• Moderate-level care
• Semi-aggressive nature
• 24–30 °C temperature
• pH 6.0 to 7.5
• 1–15 dGH hardness
• 38 litres minimum
• Carnivore diet
• Top-of-tank lifestyle

Worth knowing before purchase

Females from the mustard line photograph poorly and look far better in person — the two-tone gradient needs movement to show. She ships UK-wide with a licensed live-animal courier under our live arrival guarantee.