Koi Roundtail Grade A Betta (Betta splendens)

Top-grade koi patterning on a classic rounded tail, meaning the marbling gene behind those orange-white-black patches is expressed cleanly with good contrast between colors instead of muddying together. Like all koi bettas, the pattern can keep shifting subtly as the fish matures thanks to the same jumping-gene mechanism that gives koi carp their patchwork looks. Solo housing only.

Care level: Easy · Temperament: Aggressive toward other bettas · Max size: ~3" · Min tank: 5 gal · Diet: Carnivore, betta pellets + frozen