Capt, Amanos are larger than the Cherry Shrimp and the Crystal Reds, however, a person on another board lost his ghost shrimp to some guppies that were perhaps the same size as the guppies! Endlers are so similar to guppies, I would consider them the same category.
However, my opinions are solely my own in that I'm personally not comfortable with predation. I don't feed live foods, either. Therefore, I don't like any possibility of the shrimp being eaten -- and if there are adult shrimp, there will be baby shrimp (Amanos are harder to breed than the Cherries and the Crystals). Others wouldn't have the same concerns as I do...