Buy enough 11" flex watt that will either cover the back wall ornall 3 sides. The go to Michael's and buy a cork board roll. It's 14.99. Tape flex watt to glass and cover the flex watt and glass with the cork board. Cork board should cover the glass from base to lid.
Set the flex watt accordingly to help keep ambient temp up. And cork board helps retain the heat and allow it to dissipate thru the glass.
Will cost less than heat bulbs and won't sink the humidity.
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