So far so good! I fed Phred a rat tonight because I noticed his belly is super pink and I didn't want him going fully into shed without a good meal in his belly. The fuzzy rat was a great fit (actually saw a lump in his belly for the first time ever) but it took him FOREVER to eat because he ate it backwards. We are feeding Matilda tonight too because apparently she can smell his rat (even though it is in the cage next to hers) and is actively searching her container. Having to give it a few hours to thaw, but should be ready in about 20-30 more minutes. We'll see how she does with a rat. Thank you to everyone who helped with advice on this!