I just have a heap in my sump I dont know how to keep them alive for that long because when I get egg carying shrimp i usualy seperate them into my last compartment in my sump and once they hatch the pump sucks them into the tank seahorse food lol
but in saying that i do miss some and I have little shrimp alive that I didnt catch so they survived somehow I think lack off predation rocks to hide from other shrimp should do the trick
I haardly even really feed my shrimp they just get watever comes outa the tank into the sump