Rough coats and wet bottom

[SatanicIntention]

Could be any number of things from poor diet, poor housing, too crowded, internal/external parasites, poor breeding.

I would take a fecal sample to the vet and get it analyzed for internal parasites. Treat all of the rats and mice with a good dewormer, clean the cages and then re-treat.

Make sure they are NOT crowded, make sure the bedding is not dusty, switch to aspen or sani-chips, NO PINE or CEDAR. Make sure they have plenty of fresh water and a good diet. No grocery store dog food as their only food. They need a good lab block such as Mazuri 6f or 9f, or Harlan Teklad. You can always supplement with a cereal mix like the one I've written up as a sticky.

To help diarrhea, give them plain yogurt, or vanilla(no high fructose corn syrup added). Most fruits and some veggies give them diarrhea. Oatmeal helps too.

If you're not willing to get them dewormed or put on antibiotics if need be, then please euthanize them all and just buy frozen. They are living creatures and need to be treated as such. Crappy prey items equals crappy snake growth.