One of the LFS here has a Giant Hawkfish named spanky thats about 14" (He is the store pet and a really awesome fish I want him so bad I pet him and hand feed him every time I am in there). They sold him 3 times and he has come back every time because he kills everything he put in with, his casualty list includes a 2.5' green morray,a 2' wolf eel , a 10" niger trigger, a 10" bursa trigger, a 14"clown trigger, a 2' saddleback grouper, a 18" panther, a football sized puffer(either a dogface or porcupine don't remember), and 2' bambo shark (he keeps this list to show people why he will not sell him). I don't know if spanky is abnormally aggressive or if all giant hawkfishes are like that?