That doesn't suprise me too much, especially the size difference, in my mind I lump puffers in with Lion fish as far as fish eating aggressive behavior with a puffer being more nimble. They will make a meal out of smaller fish, although a 6 inch naso may be a bit of a stretch. And they eat alot my 7 inch dog face eats sooo much food, I can feed 3 or 4 oysters a day and they will be gone by the time they his the sand if I drop them in one at a time.