If I was in your position I'd get rid of any mice with tumors and any mice related to the ones with tumors..aka..the parents of them*if you still have em*, and their babies or just dump all of them and start fresh. Especially since you don't have THAT large of a colony.. I just had to cull half a dozen weaner rats today cause they were all half-wits and could only run in circles...mildly amusing when you put em all out on the floor and they all just run in 6" diameter circles over and over. LOL, it looked like a mini rat circus...but still they were defective, and I like to have 100% healthy feeders.
Also as far as the ones with sores on their bellies/teets...this is their last litter...replace them after their young are weaned(or sooner if you think you can foster their young)..
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