the most important thing is the tempeture....he must bekept above 68 degrees or the animals internal organs will begin to shut down.....another thing is it must be secure from other predators.....there must be moving water.....a large blanket box (clear plastic) with a fish tank aerator.....and a warmer for the water....check with your local fish store for that.....oh yeah and a source of heat from a bulb....not too close to the basking branch.....and for nighttime moon light imulation....try black phosphorous....it imulates moonlight VA;s...........make sure he/she has plenty to climb on.......and cover it securely to protect from the elements.......dont abandon the poor animal either or the iguana gods will torture you soul in the afterlife.......lol