I would say stay away from the commercial food. Iguanas do much better on the fresh veggies and greens they eat. Although, I know tortoise keepers that kept their tortoises sucessfully on that food and the tortoises seems to be doing better on it for some reason, but I'm not sure how iguanas will fare on it.

And, lastly, yes, you can feed your ig hibicus flowers and leaves. They are a great treat. Here is a link to food chart to help you decide which to feed your ig on occasion and which one to use as staple. Good luck!
Food Chart

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