What to feed hopper mouse?

[CALM Pythons]

I'm pretty sure the fleas came from either my dog or one of my cats. It was more than likely my cat. She was a rescue and likes to disappear for a few days at a time. I was leaving for work one day and found the cat on my front porch and she was hanging out with two raccoons. I also randomly have fleas in my yard so I'm preparing for the worst. I was thinking about cutting up a flea collar and putting the pieces in a small container with holes in it, then putting that in the cages somewhere that they can't get to

I wouldn't put any chemical near the feeders as it would then be ingested by the snake. Pesticides are poison for a reptile