I just got peppermint shrimp for my tank today for the aptasias. as soon as i put themin though, one of my yellowtail damsels started biting at it and chasing it around the tank. the shrimp got away and hid behind my power head. i don't know where the other one went.
it should be fine, the fish was just trying to see if he was eatable. after all they are feed shrimp. the shrimp should hide until he gets more comfy, and you won't see him out unless your feeding the tank or its night time