I have a coral banded shrimp and recently added a Nigerian Triggerfish to my 75 gallon aquarium. The Trigger has been in the tank for about 4 weeks now and I haven't witnessed him even paying attention to my shrimp. He has tried to "pick on" my hermit crabs though. (I haven't seen my horse shoe crabs since the were acclimated, maybe him, maybe not?)
I still consider myself a newbie when it comes to saltwater tanks even though I have had my 75 gallon set up for about 2 years (and proud to say I haven't lost a single fish!, but I am an Anemone slayer.