I raised and bred AFT's for a number of years and kept the thermostat anywhere from 91 - 95, depending on the set up, how the gradiant was on the cool end etc...
If you are keeping your geckos in longer units to where the gradient will be at least 92 on the hot end and low 80's on the cool end that will work fine.

Hope this helps

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Lori Kennedy
Herp-Titude