Juvenile iguanas should be fed every day until they are about two years of age. Once they reach two years of age you can feed them every other day. Be sure to remove all uneaten food within a few hours. Fruit and vegetables can spoil easily, especially under the heat conditions of the reptile enclosure. When setting up the reptile enclosure, the larger it is the better.
Most aquariums are too small to accommodate a full grown iguana.
Most dedicated owners who have had the iguana for some time turn to custom made enclosures with glass doors and a combination of screen and wood to help balance heat and ventilation. Regardless of the style, you choose you must have one that is escape proof, unless you don't mind finding your iguana in odd places. It should have a lock on it. If you decide to go with an aquarium-style enclosure for the time being, you have to be sure that the aquarium can support the light structures needed for the iguana. As for items in the cage, you should have a ceramic feeding dish.