I probably should've mentioned, he's currently taking weaned fine, the ones he's rejected have all been smalls. The weaneds he drags entirely into the hide with him to eat - I wonder if maybe he can't fit the smalls into the hide with him and is abandoning them because he can't find a "safe" place to swallow them? The heat thing is definitely something I've considered too. Sometimes they're hard to figure out - I could just let him eat weaned since that's what he likes, unless it's worth figuring out a setup that he's comfortable eating smalls in. But if the nutrition is the same I guess it doesn't really matter?