Ya most people I know offer food during the night when the lights are off and the temp has dropped, so if your trying during the day he may have better reaction to the food at night. The offering food twice may be stressfull but you have to do what you to do to see if this is the problem I guess. When you try at night also leave the room and then check on him in 10 to 15 minutes to see whats happening. Some peoples pacmans from what I have read on here in different threads are very secretive eaters and wont eat if your in the room as weird as that sounds.