I've thrown some into a tank with around 13 ppt and no survivors. Granted, I don't recall now if these were amanos or "not-amanos" (sold as amanos, but clearly not amanos). Didn't think they'd survive anyway.
Having said that, I do have a "not-amano" that's berried so I'd like to give it a try again, just need to set a tank back up. Have a tank with saltwater in it atm, but it needs to be dumped/refreshed, new light and air back onto the tank.