Ok, first of all...
... why two?
Two iguanas = 2x cage size; 2x food; 2x work.
The cage itself is part of the reason.
For starters, it offers no hiding spot, no climbing area, nor anything that can remotely stimulate a bit of natural behavior.
So you definately need to improve it quite a bit.
Second, the aggressive one is sharing the place with a second iguana, which means they will compete for food, for basking spot (if any, not visible in the pic), for space. Everything.
Which means one will emerge as dominant over the other, which can cause stress to the lesser one, etc etc.
Third, it is normal for newly acquired/adopted iguanas to feel stressed and freaked out in their new surroundings. A week or two at least will be necessary to get used to the enclosure, the daily routines, your presence, noises, etc.
Which also means, no handling. First step is becoming a neutral presence, once that is established, you can start slowly attempting some interaction.
Those two will soon enough outgrow that enclosure, which means you will later either have to house them in two properly sized enclosures, or a very very large one, that will offer different basking and feeding areas, as well as hiding areas.
As you can see, iguanas are not easy, hehehe.
Definately check out the Melissa Kaplan website on iguanas for loads of (free) information. Her book, as well as James T Hatfield's are excellent.
Oh, and do remember to have them checked out by a vet (de-worming, fecal sample, etc).
Let us know their progress. 
-IJ