Ugly Genius, a frequenter of FishProfiles, responded to one of my posts with some great news. He found the species identification on the German site I cited below. Clearly, the shrimp I have are Caridina/Neocaridina zeylanica.

The whole blue vs. red thing is still unclear to me, especially since today Balder, Sif, and Tiny Clanger all look alike. We'll see.