i just got a 5 inch aro this weekend, @ the LFS he wasnt spooked when i walked up to him.
But in my tank he always got spooked when i came near him. What i do is, i will stand right next to him for a few minutes, and drop his food one piece at a time, until he eats them all. So i spend about 5-10 minutes watching him eat. He is already starting to approach me when i come near the tank
Oh, he is in a 125 gallons, and i had him for 3 days now