I used to have a Rhino Iguana. They eat the same thing.
Look on Google for Iguana Salad and it will give you ideas.

I fed mine about 80% leafy greens.(Collard,mustard,turnip)
Then mixed in about 10% Butternut squash. Its highest in calcium.
Snap peas and green beans make up about 5%.
Any small amount of fruit for flavor is ok. I used Strawberries.

The butternut squash can be hard to prepare. I used a cheese grater and shredded it.
After I mixed all the ingredients I would press some paper towels into it to dry it a little then put it in zip lock bags and freeze. In an hour I could make enough food for months.
Make sure you have a good mercury vapor bulb that you replace ever 6 months. Put it on a timer so you never have to mess with it.
And don't forget supplements.