It is almost too easy to heat a terrarium but when it comes to cooling a terrarium i can not figure out an affective method. I have a 75 gal aquarium under T5 blue lights. I have raised the lights as much as i can while still maintaning decent light levels. I have set the aquarium on the floor on the cold end of the house and it is still 70 degrees. I need it to be about 60 degrees. Besides while putting ice cubes in the aquarium every day i have not been able to get it below 65 degrees. Any ideas or suggestions would be appreciated