We all know that there are number of successful ways of keeping iguanas and we also know that lifestyle, environment, time which can be spent on careing, etc., are all different in each keepers. So there are no hard-and-fast rule of Iguana Care, but at least, there are few common basic points that you shoud follow.
These are "Space", "Temperature", "Food", and "Light". No matter if you are a long term keeper and/or numerous keeper, and no matter where you live, these 4 points will always be the foundation. If you keep these basis, your iguanas will eat bunch, poop a lot, grow big, be healthy, get tame, and be happy.
Point index.
Since we live in Japan, you may need to convert some expressions to suit your culture.