Petsmart husbandry is generally never very good. They don't use proper equipment or offer proper enclosures for their animals.
Analog thermometers are junk and are often WAY off.
Also, why are you buying rats from petsmart? My gosh, I'd be so broke if I did that. Lol
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My problem exactly haha the rats are 12 dollars! I have no clue where else to get them because where i live there is no normal pet store, only these chain "supermarkets"