I guess I'll just try the Ivermectin for now.
The babies are pretty much all at fuzzy (almost hopper) stage. And I have a few mink with merle....which is why I don't want the babies to die from any treatment (they're GORGEOUS!). Otherwise, I'd probably just put all the rats down that are on that rack. Or use the most potent and effective treatment.
The girl I got from the rattery no longer has mites. And she had them REEEALLY bad. Her ears got terrible and she got thin and incredibly weak. I just used baby oil and covered her ears, tail, feet, then a small coat on her fur. It made her look terrible for a little while, but she cleaned it all off and it definitely went through her (the poop is shiny. Haha). But she no longer has mites. I think I only had to put it on her twice and after that I never had any problems. And it's non-toxic. The only reason I don't want to use this again is because with how many rats I have that have mites now, it would take quite a while and my arms would probably be completely scratched up and bleeding.