Ball python heat at night

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Hi guys so i got the right temps set for the day but at night my house gets really cold. In the tank abmbient gets a little under 80 and his spot under the lamp goes from 85-80. Are these temps safe at night or will he get sick? I am using 75 watt infared at night.

[JodanOrNoDan]

The min the hot can be is around 84, anything lower will affect digestion. Temporary drops to the mid seventies are no big deal but on a continuing basis you may be courting a respiratory infection and regurgitation.

The ideal temp ranges are on the BP care sheet. Hot spot should be around 90.