He may just still be settling in, obviously this Is a much larger space than he's ever had. In his mind he may feel insecure after going from being cramped up to being able to explore and move more. I wouldn't call it aggression yet, let him settle in a bit more. It's probably just defensive. Imagine being picked up, dropped in a strange place and then something reaching for you.
1.0 ball pythons - Koba
0.1 pitbull/lab - Cinnamon
0.1 collie/elkhound - Fluffy
0.2 children
1.0 boyfriend