So I have an 18x18x18 exo terra terrarium for my green tree frogs. I attached the heat mat temporary at the side of the terrarium as seen in the picture.

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The inside temperature of the glass at which the heat pad is attached is about 75-82 degrees fahrenheit. Since it is attached at the outside of the terrarium I am loosing alot of heat from the other part of the heat mat. Do you know where I can attach the heat pad or how can I solve the heat loss problem?