Sick dumbo help

[Sita]

That is porphyrin, which is produced under stress and/or when they are sick. Basically, wherever you got them from was not taking very good care of them. It may clear up if they are kept in a clean environment and fed a healthy diet. The one that is thin and breathing heavy may be suffering from mycoplasma which can be spread to the other rats. It can be cleared up with a course of antibiotics from a vet, but she'll always carry it, if that's what it is.

If you were wanting to breed, I wouldn't with this group. There wouldn't be any risk feeding them to your snake. Whatever is making them sickly won't affect your snakes.