18 gallons is really very small for a terrarium if its a true closed system. EVen if you just use the regular lights that come on an aquarium hood, your temp may get to 78-80F.
I have a 135 gallon tank set up with 2 flora grows from the Petsmart store and the temp stays 75-76 in that with the lights on 24 hours a day for some bromeliads and an Angraecum.
I am not an expert though.
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