Mixed-Color Betta Fish (Siamese Fighting Fish) showcase striking multi-colored bodies and flowing fins, blending shades like red, blue, turquoise, orange, and white.
Common Patterns: Includes Koi (marbled patches), Bi-color (body one shade, fins another), Butterfly (banded colors on fins), and Multicolor (3+ distinct colors).
 Behavior: Highly aggressive and territorial; males must be kept alone in separate tanks.
 Size: Grows to about 2.5–3 inches (6–7.5 cm).
 Care: Needs warm water (75–80°F / 24–27°C), a filter, low water flow, and a minimum tank size of 5 gallons (19 liters).