Just try not to startle him, and try not to be startled if he jerks or twitches. If you slide open his tub or open his tank and he's looking at your hand like it's dinner, try to tap or nudge him from the side or from behind to kind of snap him out of feeding mode. I have a genetic stripe female that is always in feeding mode when I open her tub so I have to be careful with her...Just be nice and calm and mellow and all will be good...