My ball is just over 3 years old. This past winter, he went on a feeding strike for about 6 months. I live in a 100 year old house, and we had some issues with the furnace so we had a bit of trouble with regulating the house temp for a while. He finally ate in April, then skipped several weeks, and ate a couple times in June. The last time he ate was June 30. Up until November/December last year, he never refused a meal even in full shed-eyes blue and all. Now he wants nothing to do with a rat when he's even when he's just starting to show the pink belly stage of shedding. The first time he ate again, it was an ASF that the pet store got in with their regular shipment of rats. I know I don't want to get him hooked on those, and anyways, they are not easy to find around here. He just shed last night, so I tried to offer him a rat this morning-he seemed slightly interested till it got close to him then he jerked back from it. I watched from a distance for about 10 minutes, then took the rat out. (he has never touched f/t-I've tried). Should I get another ASF just to get him to eat something? His activity level is the same as it has always been; there are no signs of RI-no wheezing, bubbles or discharge.
FWIW, my cage is a shelf that we modified to house my BP on one level and my BRB on the other. I've not had any issue with my BRB eating, she still eats like a little pig.

Here's my cage:

Top level is my bp, bottom is my BRB. Heat cable has since been run differently, a second hide has been added for the ball, and a different water bowl put in. I know it looks plain compared the the BRB, but any time I have tried to put anything additional in there, he will not come out at all until the items are removed.