Hello everyone, I just bought a new hatchling pastel spark ball python on July 2nd from a local reptile store. The worker told me that he ate a F/T pinky last week and that I should try to feed him again on Wednesday(July 6th). As Wednesday came around, I got him out of his tank and into a separate feeding bin as I was instructed by the reptile store and thawed out a frozen pinky and got it to around 96 degrees so it gave off a heat signature. I tried to offer it to my baby and no matter what I did he would not even seem interested in eating. He even put his nose directly to the pinky and did not strike, just ignoring it and continuing to explore the tub. He doesn't seem to be stressed out in his new environment as he is very active in the nights and is always exploring his new home. Could I be setting up his tank wrong and that's why he doesn't want to eat?

On the hot side of the tank it is 88 degrees and the cold side is around 78 degrees.
The humidity ranges from 50%-65% with daily misting.
1/2 inch of cypress mulch substrate

http://imgur.com/a/15QDc (Pictures of Tank setup and Log)

He seems to spend most of his time in the log, could this be a sign of improper hides which could make him to stressed to eat? When should I offer food again?
Any help and opinions are greatly appreciated since I am starting to get a little worried that he wont eat.