Thank you everybody. =] He's definitely a cutey!
And also, thank you for the clarifications on what a truly overweight little guy will look like. He's just a good eater then!
So far he seems to be settling in well - he spent a little while exploring his tank, and then settled into the hide on his warm side. He watched me for a little bit yesterday from his hide (stuck his head out and followed me around the room for a bit) but he eventually fully pulled into his hide, and I haven't seen him peek out since. He may or may not have explored during the night, but so far this morning I haven't seen him. Hopefully, as they say, a hiding ball is a happy ball! In a few hours I'll check the tank for any spot cleaning that needs to be done, and I'll change out his water. We'll see how he is with my hand in the tank.