Can i put the male and the female together when the female is pregnant wif some water plants and let the female just give birth without a breeder net of a livebearer trap.
Yes, you can. The male might start stressing her out a little, to get her to have the babies, so you'll have to watch that. Might want to have a few more females too. Then if you have floating plants, I think a lot of fry will survive.
If you are just putting one male with her while she is all alone this is a bad idea as the male will most definatly harrass her, you should have at least 2-3 females for every male you have as they will help spread out his attention better and so reduce the chances of him constantly picking on just the one female.