Triggers can be very aggressive with just about anything. Had a Huma that was about 3 inches long that 'tested' everything with its 'beak'. Glass, tubing, and even a dog face puffer 3-4x his size. He beat the Puffer up badly (fortunately he survived and is going OK now) I had to pull him out of the display. Only thing he can live with is a Foxface..guess he respects the 'spines'. Needless to say, I'm avoiding the trigger family.