Female Koi Betta (Betta splendens)

The Female Koi Betta (Betta splendens) is a stunning marbled showpiece fish, displaying a unique mix of red, orange, black, and white blotches reminiscent of true Japanese koi. Hardy and beginner-friendly, females are typically more peaceful than males and can be kept in well-planned community tanks or sorority setups. Browse our full freshwater livestock and live plants to build a tank she'll thrive in.

Care Guide

Female koi bettas adapt well to most planted community tanks, provided their needs are respected. Each fish carries a unique pattern that often shifts and intensifies with age — no two are alike.

• Tank size: 5 gallons minimum for a single female; 20+ gallons for a sorority of 5 or more females.
• Water temperature: 76–82°F. A reliable heater is essential — bettas are tropical fish.
• pH: 6.5–7.5, soft to moderately hard water.
• Filtration: Gentle flow. A sponge filter or baffled HOB protects long fins.
• Diet: Carnivore. Feed a high-protein betta-specific pellet, supplemented with frozen or freeze-dried bloodworms, brine shrimp, and daphnia.
• Decor: Heavily plant the tank. Floating plants, driftwood, and caves give shy females places to retreat and break sightlines in sororities.

Specifications

Compatibility

Female bettas are generally peaceful but still have personalities — observe carefully when introducing tank mates. Good companions include small, non-nippy schoolers and bottom-dwellers:

• Neon tetras and other small, peaceful tetras
• Corydoras catfish
• Otocinclus and small plecos
• Nerite snails and dwarf shrimp (with caution — bettas may pick at shrimp)

Avoid: male bettas (will be attacked or attack), fin-nippers like tiger barbs and serpae tetras, and any aggressive cichlids.

Recommended Foods & Supplies

• Seachem NutriDiet Betta with Probiotics — high-protein staple
• All freshwater fish food
• Live freshwater plants for cover and water quality
• Browse all freshwater livestock & supplies

FAQ

Can I keep multiple female koi bettas together?
Yes — in a sorority of 5+ females in a 20-gallon or larger, heavily planted tank. Fewer than 5 often leads to one fish being targeted. Always have a backup tank ready in case a female needs to be separated.

Will the koi pattern change?
Yes. Marble-gene koi bettas continue shifting colors and patterns throughout their lives — that's part of their charm.

Do I need a heater?
Absolutely. Bettas are tropical and need stable 76–82°F water year-round. Cold water leads to lethargy and disease.

Can I keep her with a male betta?
No. House males and females separately except for short, supervised breeding setups.