Do you have a light over the Crestie's tank? If so, they don't need any lighting at all, and generally do best with just ambient room lighting and kept just at room temperature (ideally in the 70s F).
You might try putting a damp towel over part of the top of the Crestie's tank- this can help with both the temperature (as the evaporating water will bring the temp down a few degrees) and maintain humidity.
IDK much about Leos, though- so can't help ya with that part.
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