I'd like to put a dozen Amano shrimps in my 40g cory tank (peppers, bronze, julii and panda cories). I don't see how the cories would kill the shrimps but I better ask.
I have 3 amanos 2 otos and 6 corys in a 40 with a bunch of other fish. They all do fine. The amanos do tend to disappear in the plants for a few days at a time.