Also called the Peaceful Betta, the Crescent Betta is widely-distributed throughout Malaysia, Vietnam and Thailand as well as the islands of Sumatra and Singapore. They are much more peaceful than their long-finned cousins, the Siamese Fighting Fish. Crescent Bettas are named for the red crescent visible on the edge of the caudal fin and have a dark black or brown body. These fish remain relatively small and can be kept safely with other small, peaceful fishes.