well i was leaving him alone for a little while because it seems like he's going to start the shedding process so i didn't want to stress him out.. i should have checked his substrate more.
i'm not totally sure he's yellow belly, that's just what the breeder that i got him from told me. but he could have been wrong. this is a picture of him when i first got him so you can see his coloring.
http://www.flickr.com/photos/1016706...n/photostream/