Their tails are fan like, but what makes the Siamese Fighting Fish such a typical pet is its beautiful colors. In the pet industry world, they’ve been breed to be a rainbow of color, from dark blues, reds, black, orange, white, green, or even turquoise. However in nature the fish aren’t so flashy. They are clearly present in dull colors like green, gray, or brown. Although the fish are becoming common family pets, it is bad to put two male Siamese Fighting Fish in a tank together. Nature takes its course and they will kill one another.