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Florida is a humid place, so a screen cage should not be a problem. Some iguanas do turn a dark green when they are not healthy, cold, and etc. Some do not. My iguana is not very active, she is very laid back and does sleeps a lot, but as soon as she sees food, I have seen her jump very far to get to that plate as fast a possible.
Does your iguana have easy access to water? I am wondering if the pellets may be impacted, pellets are okay, though they should be mixed with water before feeding.
Have you taken him to the vet? This looks to be the next step for you, after 3 years you should know your iguana very well, if you are concerned than I would definitely have him checked out.
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