I've never had a problem with them taking shore/grass shrimp from me. Only took a couple of tries with dead ones and they never looked back. I tried using store bought shrimp and the female was the only one who would readily take them so I gave up on that for now. I think they really noticed the difference in shape and color and decided it wasnt a trigger. If anything they will over feed on shore shrimp if i let them and then leave half eaten bodies on the floor.