Robert
As much as you dont believe it, you have a normal baby rhino. active in the morning and hiding in the day is normal. If he chooses to sleep he must be conmfy in his new home. Dont lower the basking temp. It actually does the opposite you think and besides its the right temp. As long as food goes in and comes out the other end, everything you describe is pretty normal. You need a few more lights ;p

jf