Echoing @ashleyraeanne. Black out the sides or even cover the tub with a towel, let him be hidden.
I know it’s exciting to get that first snake, trust me I do. I remember it vividly. But you really need to do what’s best for the animal. Leave it alone. Get it off your desk. Put it somewhere out of sight out of mind so you can force yourself to leave him be. The little guy should see you change the water in his dish once a day or every other day and that’s it for 5-7 days minimum.
Trust us. Play it safe, and you’re way less likely to have a tough time getting it on food in a week and he’s going to settle much quicker.