To be honest sometimes that just happens. When balls are in onr enviroment and are moved to another they can become stressed and get an temper. I wouldnt think too much of it. Just allow it time to relax and adjust. As long as hes not losing too much weight no food is okay. However at somepoint he will need to eat. I had a lesser just like that nicest snake ever until i took her home now shes aggressive and hisses like crazy. Just give it time and work with him. Just as i said watch the weight if he starts to lose noticable weight the he needs to eat.