Cute new little corn, they are great snakes. 20gallon is pretty big for a baby corn, I usually kept them in shoebox tubs for the first year or small exoterras. Same deal for any new snake regarding handling - leave him alone for a few weeks and only interact to remove for cage cleaning and opening cage to offer food.
Sometimes baby corns can be picky starters but if he's already established then that is a good sign. Corns are active little wrigglers and don't normally just chill in your hand like a BP will. Generally they are docile and sweet snakes but as babies, they get nervous easy and may be puffy and get into 'cobra stance' to try to scare you off. They usually grow out of that (although I have one still that will bite me every chance she can get).
This is Quartz, a ghost motley I used to have, when he was a baby trying to act like a tough guy
But generally they are nice ambassador snakes. Here I am showing Ruby (a sunglow motley corn I used to have) to someone at a reptile show
holy smokes, well, congrats!