Try feeding him in a seprate container so he knows when u reach in his enclosure ur not food. I take my guy out of his vivarium and put him in a box for feedings. its worked out well. Hasnt bit me...yet. Hes only a few months old. Do u feed live or frozen food? if u r feeding live food he will tend to be more aggressive.
~Angie~
Red Tail Boa
Albino Lavnder Reticulated Python
Green Anaconda