Double-line side, also known as Thai crucian carp and red fin crucian carp, likes to swim in the middle water. It is agile and gregarious, and looks like an ordinary crucian carp. Young fish have no color, while adult fish have shiny silver scales. There are black and red double lines on the edge of dorsal fin and caudal fin, which is very beautiful. This kind of fish is a large ornamental fish that is easy to raise. This adult fish is 35 cm long.

Two-faced fish can be mixed with docile big fish, such as embroidered lucky fish. It can eat the excrement of other fish and is an omnivorous fish.

And butterfly fish, just like its name, its tail fin is like a butterfly, which is very elegant. The whole body of butterfly fish is white, especially in the light, which is more holy. Although it is also an omnivorous fish, it is relatively small. If mixed with two-faced fish, butterfly fish will not eat food and starve to death.