Somewhere under that mass of shrimp, there is an algae wafer.
I sent myself 100+ wild cherry shrimp (neocaridina denticulata) from Hawaii to myself in California. I used a bag with riccia, and almost all of them made it! I'm very, very pleased that my little lovelies made the trip safe.
A photo of one of the many pregnant females. ^^ There are 15 or so females in the tank (at a glance) carrying eggs, and it seems that some of them dropped eggs during the trip because there are baby shrimp swimming about!