That isn't necessarily true. Iguanas continue to grow all of their lives and to keep them in a small cage would be cruel. It will not stop them from growing. There may be some reptiles or fish whose growth varies with cage size. Iguanas definietly do not fall under that category. I don't care what some experts say. They probably don't have iguanas.
Sorry if I sound upset. I just don't like hearing about iguanas that get abused because of misinformation.
I think your cage is very nice and plenty big enough for your big guy....he is very beautiful and big....Here is a picture of the new Ig cage I just built(5x4x3)....iglue(the tenant)is about 2 years old and is about 27" long.