How to change a diet from rodents only to nightcrawlers and stuff?

[GrifTheGreat]

Conditions are perfect. They even have their own room, so no disturbing. Tried crickets, roaches, pacman food, nightcrawlers, raw meat. They are without food for nearly three weeks now. Next week I will consider specialized vet.
I am really clueless at the moments, no other strange behavior.

But lucky me because of the tons of belly bacon they have.

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Don't feed them raw meat. No good can come from it. Have they had a bowel movement yet?