Housing more than one together actually isn't bad for them as long as room is properly managed. Most people who own iguanas own several, letting them have the run of an entire room or house together. It's usually only a problem due to overcrowding, poor management, or not offering enough room for each, when stress occurs. The only time I would worry is with large adult males who should be isolated from others and left alone during the breeding season.
I agree, proper greens should be the staple diet, with fruit and veggies being secondary. A good Vitamin D supplement is also recommended. They will eat when they want, but they won't eat everyday - or even drink every day.
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NMGA miniature meat goats, Silver Fox and NZW Rabbits, Muscovy ducks, several breeds of chickens, fancy mice and rats in Michigan