A 55 gal. will work fine for the first year. This will give you plenty of time to plan a new one...

. If you don't mind, here is a questionnaire that is used on a couple of other email groups. It looks intimidating, but it really helps find trouble spots. Some of these questions everyone has already been helping you with, but there are some that haven't been answered. Here it is:
__________________________________________________ ______________
2. Name(s) of your iguana(s)
3. Snout-Vent Length (snout to vent length = nose tip to poop chute) and Snout-Tail Length (snout to tail length = nose tip to tail tip) of your
iguana(s)?
4. Age(s) of your iguana(s)
5. Weight(s) (if known) of your iguana(s)
6. Where and when you got your iguana(s)
7. Heat sources/types? DAY? NIGHT?
8. Temperatures (basking, overall, cool and nighttime)
9. Lights (wattage and brand/type)?
10. What type of UVB (type/brand/length)?
11. How Far above your iguana is your UVB source?
12. What kind of substrate you use?(that's the stuff on the floor of
your cage)
13. What type and size of enclosure you use?
14. What does your iguana eat (diet)Please list specific foods?
15. Humidity?
16. Have you taken your ig to the Vet yet?(if yes, why and what were
the results?)
17. What other pets do you have?
18. Have you owned iguanas before? If yes, where are they now? why?
We know you're new at this...so don't answer...
19. If you own multiple iguanas, are they housed separately?
20. Your age: if under 21 exact age please over 21? Y/N
21: Where are you located? State/Country