Am i hurting my iguana?

i got my husband an iquana when he graduated fromcollege in febuary. they said he was about 5 months old. i have been haveing the hardest timegetting him to eat. tryed putting green chopped up with fruit in his bowl he wouldn't eat that. i got the soft jell iquana food, he ate a little of that not much. i got the canned iguanna juvenile food he did ok with that but still not great. So i tryed pureeing the fruits and vegys and putting it in sugar free jello. he loves it but i am afraid it might be bad for him. Am i doing more harm than good for elivis the iguana?