I wouldn't mess with wood filler in an enclosure as that can give off some pretty harsh fumes. I think it would be best to offer bugs a few at a time so they can be easily tracked or feed outside of the enclosure. If that's not possible then I would just check the wood regularly and shake it or blow compressed air etc if needed.
Mirage came out of brumation on April 26. He was doing great. On May 2 he started acting funny. We just redid his tank, and he keeps going into one of his hides. He just lays there. He shows no intrest in food. HELP!