Personally, I find seperating the pregnant shrimp from the main tank unecessary, but of course you can if you really want to. If the adult shrimp are well fed, they show little interest in eating the floating larvae (from what i've seen at least). I just keep all of my ghosties in one tank. No hassle and it works fairly well.
I don't add salt and breeding occurs without a problem. Fry survival doesn't seem particularly affected either and is mainly depending on whether they get food. I didn't target feed (due to time issues) the most recent larval hatch and I think I lost 95% of them. No big deal though.
Yah shrimp are really interesting to watch, they interact so much with their environment and the other organizms in it. Glad to hear an update from you Olga!
