A: First, make sure the terrarium is large enough, a 30″” cage for iguanas less than 18″” long and 48″” for those that are larger. The daytime ambient temperature should be between 83 degrees and 86 degrees Fahrenheit with resting sites between 93 and 97 degrees Fahrenheit. Iguanas also like a humid environment — 80 percent or higher. A bowl of water placed in the cage near a heat source can provide added moisture. The UV in sunlight is necessary for iguanas to regulate calcium, so a full spectrum fluorescent light inside, or directly above the terrarium, along with the appropriate diet, can help insure healthy development.
Source: Premium Nutritional Products, Inc., Lenexa, Kan.