Good advice from cory. What I would do is keep humidity around at least 70% even up to 90%. Thing with fanatasy is there mixed with cranwelli, which require moderate humidity but with cornuta requires higher as its a forest species. Keep temps within 78-84 during the day, no lower than 70s during the night. Ideally use a heat bulb ontop or if heat is needed at night as well as daytime, use a ceramic heat emitter connected to a thermostat. Heat mats aren't the best heating option unless used underneath connected to a thermostat but many hobbyists are against this.