By the way, how do the rays divide the male and female? Besides the black and white crown, what other rays are good? thank you

Regardless of individual size: males have two small jjs and females don't. According to the refraction principle of bottom tube glass, you can know the sex by looking at the tail position. The crown black and white you mentioned is already a very good variety. A few hundred dollars cheaper. Let's talk about it (Pearl Mick, Hei Di Plum Blossom, Black and White Men in Black Crown, etc.). ).。