Hi, glad you found us here at AA! I have a 10G as a ghost shrimp breeding tank. Females are much larger than the males. When they are preggers, you can easily tell. They will have a bunch of tiny eggs where there swimmerets are. When they are pregnant with the eggs, it's called being "berried" ghost shrimp baby's are harde to raise bec. They go through a larval stage where it's difficult to feed them. If you wan to raise them, you will nee a very mature tank and some plants. IMO, a dying plant is also a good idea too. The larva eat infusoria (if I'm not mistaken) my GS tank has been set up for about 6 months and I've never seen one of my females not pregnant. With that being said, I've only successfully raised 2 ghost shrimp in those 5 months. If you really want to get into shrimp, you should start with RCS (red cherry shrimp) they are pretty cheap and very hardy. Just PM me if you have any questions
good luck!!