Amano are not predatory ... they are just as peaceful algae / scavenger eaters as RCS or Blue pearls. They'll completely ignore baby shrimp like the Amano in my tank ignores the baby RCS and Tiger. If you happen to see an Amano eating a baby shrimp, it was probably already dead. Shrimp have no problems snacking on their dead tank-mates.
However ... Amano can be food hogs ... so don't be surprised if it swoops in and takes away any algae wafer bits, pellets etc.