Maybe move the fish out temporarily to the new tank, and leave the more sensitive shrimp in their current home?
Unfortunately I can't move my fish anywhere because I have 18 tetras combined and no tank big enough to hold them : (
A big bundle of moss or subwassertang makes a great hiding place for new born shrimplets. With any luck you won't see them for the first week or two, and neither will the fish!
This weekend I'm going to go to my LFS to get supplies to set up the 17L so I'll definitely grab some subwassertang and moss for my current tank!
I'm not 100% sure I'll get this new tank done in time and I might end up leaving the shrimp and their babies in my community tank but I'm still going to set it up because I can use it if I'm in a similar situation in the future.