My 75 gallon terrarium has grown over crowded and I have recently obtained the space to move them to a different location. As for my 75 gallon tank I want to turn it into an ultrahighland terrarium. I want to know what the best way to accomplish this is. The temps with the four flourescent lights on (on average) is about 70-75 F. I think I can lower that by moving the ballasts and adding a fan to cool them off. But I would like the temps much lower for ultrahighland plants. I need a way to cool off my terrarium. I have an ultrasonic humidifier so humidity is taken care of. I also need a good way to circulate air. Any help will be most useful.