Well, I have red cherry shrimps now. I really struggled to find male shrimps. When I went to the aquarium store, I asked for a mix of males and females. The seller didn't seem to know the difference between males and females. So I made sure that I got a few that had a male-like appearance and waited. After a few months, all 10 of my shrimps had the "saddle". This is the white line of unfertilized eggs that appears on the neck of female shrimps. So yeah...all my shrimps were female. Then I went to another shop, got 4 more shrimps. Again, all female. I figured that stores don't sell males here, either because they are less colorful or because they don't want people to breed shrimps themselves.
Please enjoy some pictures of my virgin female shrimps:
And here, a picture of the ugliest female shrimp in the world, it's basically a man with eggs:
My females were in a desperate need for some male companions. My solution was buying some more shrimps, this time from a private seller. If you buy from a private seller, you can be sure that they have both males and females because they are breeding these shrimps themselves at home. A friendly woman came to my house to drop off these:
Baby males! Less than 2 weeks later, my females were pregnant with eggs, also called "berried" because the eggs look like berries. Interestingly, the eggs have different colors depending on the female. I had some with light eggs, some with dark eggs: