Temps drop too much

[Leefrogs]

I can get cage warm enough for my whites durring the day. But cold blasts, like last night, drop temp in cage to 68 to 65.. Then at daylight the temps to 80 85. Is this huge fluctuation ok? Or is this a stress to my frogs? They don't hang out near warner spot(68) at night. So is it ok?

[Leefrogs]

just so every1knows it was -15 lastnight, and I'm worried about the major temp changes. Should I not have it above 80 when I know it's going to drop so low at night? Should I go for 10• Change instead of 20.