I too started out feeding my first ball in a separate tub. Honestly I don't think he really cared where he ate, as long as I dangled a juicy rat in front of him lol. He did strike at me once when I went in to move him back to his enclosure after a feeding. After that, I did some research and decided it was much easier and safer to feed in his enclosure. However, I do feed my hognose hatchlings in a separate tub, but that has nothing to do with aggression. They're dopey, and I don't want them eating all the substrate.