When I got my last pair of Coastal Carpets, the previous owner said that they would only eat Live Mice, no rats at all.
To ensure a smooth transition on the first try, I bought two frozen mice and mixed them with two rats in one bag. I rubbed them all together real well to combine the smells. I skipped a feeding to ensure good appetites as well. So the mice were mixed in with the rats for ten days.
I feed the F/T mouse first, worked, they converted to frozen. After they swallowed the mice I offered the rats. Success, now they are converted to F/T rats.
They haven't had any mice since.
Mack the Knife, Coastal Carpet
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