With a 25-gallon, you could pretty easily get away with flex-watt underneath, and a normal flourescent fixture above. The flexwatt will handle the heat for you, while the flourescent takes care of lighting in that tight space. Just make sure you elevate the terrarium off the ground by about 1/4" or so (we use the caps of film canisters under the corners), to provide air flow and prevent the glass from cracking.
Add a substrate to retain the heat a little better and, with a room-temperature house, you should be able to get up to 80 without too much difficulty.
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Justin, Julie and the menagerie...
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