I have never heard of blue throat triggers going after usual cleaner crew invertebrates. The only ones that I can think of that he might mistake for food are the Sexy Shrimp, and thats because they are so small. You must have gotten a fantastic specimen as mine has never had that bright of blue or yellow and didn't eat for the first few days (they usually don't while getting used to the tank). Thats a really good sign for him. In my opinion, they are kind of like the manatees of triggers. They don't hurt a soul, show basically no signs of aggression, and get beat up fairly easily if you put an aggressive large fish in the tank with them (another trigger or puffer/lionfish....even a big tough damsel will easily push one around). Also, typically their mouth is very small, so don't try to feed them big chunks of food/meat, as they have a hard time getting it into their mouth. And finally, the best thing about the Blue Throat (both of mine have done this) is how loving and curious they get towards their owner. Once they get used to who feeds and cues of when its feeding time, they clue into it sooner than anyone else. Kind of like how some dogs learn the sound "food" or "walk" and go berserk. Mine currently hangs out on the side of the tank, with his eye up against the glass, to get the best view possible of people passing by, to see when I show up to feed. People don't call them "puppy dogs" for nothing.