Making a duplex then? It's still a decent size cage so I would assume he'd use that area. Maybe make it a basking area or something like that. I agree with everyone else. Time for a new Cham to put in the other cage
Ventilation is the key. The problem with the exoterra systems is that it's all enclosed in glass. No ventilation so humidity can be hard to find at a constant level. Look at the top viewed posts in this forum and there's one about a guy with glass enclosures and making it work. Take a page or...
Yea you need to contact the BBB or the version you have in Canada. Sadly I don't think the petstore is going to care what you say because most owners are there to make money and not find the right pet for the right person
Yea don't trust the little hand outs at Petsmart. I used to work there too as a manager and most people in Pet Care don't know as much as they should about the pets.