I attempted to feed again last night, but no luck. I warmed up a rat pup in the same room with lights off, and he was out and about looking like he was looking for food. When I offered it to him he showed some interest, and after a few minutes he struck, which got me excited because he's never struck before. He was watching it for a while and struck again, but in the end he just went back into his hide and stopped caring about it. I plan to switch over to Deb's method today, but unfortunately I don't have access to a different container because the ones I was looking at won't be shipped quickly enough. I'm hoping just dividing off about a third of his current enclosure will work.