First Time Feeding-A Little Help,Please!

[verymoistcrayon]

Thank you for the input! I'll feed him in the viv for now on. Anywhere I've read said to feed in a different environment, but now I understand. I've had him for 2-3 weeks now. He didn't eat the rat last night, but I have a feeling it may have to do with the heating. I only have a heating lamp on the viv currently, and he's been trying to get as close to it as possible. I do have a small under tank heat pad, but I haven't put it under yet as I am waiting to elevate the viv and put it on a stand, which I'll do today. (Me and my elevated enclosures,lol)
If your snake doesn't eat, what do you typically do the food? Do you throw it away/get rid of it or refreeze it? (I'd imagine it to be the former but I'd like to know)