Thanks to Simon and Jo, and some research, I ordered the following foods:
Dennerle 5 in 1 - hoping to find some go to foods in the samples and I suspect, with 11 shrimp, the sampler will last quite a while.
GlasGarten Bacter AE - because it seems to be a requirement to successfully keep shrimp based on pretty much everything I read
I already have a jar of Sera Shrimps Natural I acquired from my LFS, and the shrimp definitely congregate every time I put a few granules out, though never more than 8 at once.
As for the tank, first water change was today. I followed Simon's advice and dripped in the replacement water.
The experiment continues. I have only one more question: do shrimp go through a weak color period when they molt? I have seen, so there have probably been more, three successful molts. I notice that one of the larger shrimp is, at the moment, not as fully colored as the rest. Result of a molt? I am curious, although obviously I will be keeping my eye on that shrimp's color.