Should I see a rival male, I will instantly begin to fight with him. In Thailand, I am used for sport and public contests are held.
What am I?
CLUE ONE: I come from Southeast Asia and I am about 6 cm long.
CLUE TWO: I am very colorful. I can be found in various colors including shining greens, reds, and blues.
CLUE THREE: I am a popular aquarium fish.
ANSWER: I am a fighting fish or Betta