I also have a humu humu trigger-and I also had a fire shrimp and a cleaner shrimp-the trigger and the shrimps did OK together for almost 2 weeks, then one morning I saw a piece of shrimp shell floating in the tank, my trigger ate both of the shrimp for dinner. My trigger is about 1-1/2- 2 inches long. My shrimp were pretty large. He got to them before I could transfer the shrimp to another tank.