Those tiny shufeldtii crays are probably the most mild mannered crays of all. I had some in with guppy fry, they just went after bit on food on the bottom.
Kuhliis seem to have low bioload and really only act right in a groups. I also had shufeldtii crays with them with no problems that I was aware of. Both are shy.
I would try out a few cheap ghost shrimp, see what happens. Especially if you get small ones you will get an idea if more pricey shrimp will be okay or fish snacks.
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