Moonlight fish is an important species in tropical fish. It is as small, colorful and fascinating as guppies. Moonlight fish is 4~6 cm long and has strong adaptability and reproductive ability. Its characteristic is that it can cross with swordfish and breed new varieties. Common moonlight fish species are: red moonlight fish, blue moonlight fish, red-finned golden moonlight fish, golden-headed moonlight fish, double-finned moonlight fish, sail-finned moonlight fish, golden-headed sail-finned moonlight fish and so on.