Madkins007:

Here are your problems:

Iguana: high cage, lots of vertical space, lots of hot spots up in the branches. HIGH humidy but lots of fresh air.

Leopard tortoise: wide cage, lots of horizontal space, lots of basking spots on the ground, LOW humidity, plenty of fresh air.

Let’s add something to your complications: BOTH species get BIG and need BIG cages. A full grown iguana (over 6′ long) would do very nicely in a converted closet.

An adult Leopard tortoise (2′ long, 70 lbs) is going to need a wading pool-sized pen and live for about 100 years of you do it right.

Your options:
– Are you sure you can’t return the animals? Most decent pet shops give you a ‘cooling off period’.
– Sell both animals and get something better suited to small room, small budget, beginners- Bearded dragons, Russian or Greek tortoise, etc.
– Sell one animal and focus on the other.
– Sell one and replace it with another better suited to the remianing animal’s needs. It is generally NOT a good idea to try to mix species, but if you HAVE to do it, a Redfoot or Yellowfoot tortoise fits with the iguana better, and bearded dragons fit with Leopard tortoises better.

If you have to stick with both animals, try this:

– Get the biggest aquarium tank you can afford- make sure it is nice and long- height is not so important.
– Build a tall ‘tower’* over some or all of the tank, and make sure the entire aquarium is covered with a good lid. (They now sell ‘soft’ reptile cages made from a mesh for many herps. You might be able to adapt one for this need.)
– Keep the tower misted (consider adding leaves, etc. to help hold humidity) and well-heated, furnishing it with sturdy branches for the iguana to climb on.
– Outfit the lower tank with the right set-up for the desert-like tortoise needs.

By doing this, the two animals will pretty much ignore each other and hang in their chosen habitats.

I don’t mean to preach, but this is why experienced animal keepers always tell new-comers to do their homework before they buy.

Good luck!