Does your CBS go after fish? Mine would try to snatch at fish when I first got him and didn't do any other shrimp with him until he "calmed" down a bit, and he just keeps to himself, hanging upside down in the middle of the tank rockwork.
If you watch your CBS that might give a clue, I would try a couple peppermints first, they are cheap in case your CBS is aggresive.
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