First problem: 81 is too cold for a hot spot.
You want your hot spot to be around 90-92. Cool side 80-81 and an ambient temp somewhere between the two. How are you measuring temps? Where are you measuring temps? How are you regulating the temps?
How big is the tank they are in? How warm were the rats when you offered them? What is your substrate? If its too big of a tank, they might need more hides to feel secure. If its too small, that could also be a problem.









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