It ain't gonna work. Run through the Amazon and hit a sheet of something that you can't go through, but can see through, I dare you. Give him some room to grow and move around. Try a 40 Gal. Just don't cramp him.
Stress ultimately leads to death, if left unchecked.
Well, we have his tank now. Next is bedding. Let's do about 1.5 to 2 inches of bedding. Don't bother landscaping, he's going to rearrange it as he wants it. The geography book says there are trees in the jungle and we already know that iguanas live in the trees, so branches or climbing posts are next on the list.