Wesly,
PLEASE research iguanas as pets. Romaine and spinach should not make up even a signifigant portion of a diet, let alone the full diet! that is like you eating only mcdonalds and hotdogs your whole life.NOT good.
greenigsociety.org
anapsid.org
iguanaden.com (.org?)
this site, and many others can teach you the basis and above of iguana care. I would be worried about all of your iguanas suffering from metabolic bone disease,and possibly thyroid problems? due to the spinach and lettuce. Caught in time, getting them checked out by a vet, and adjusting their care should help. The picture you posted, by the way, is a beautiful iguana, although looks are not a reliable way to tell health
Heres some pics of my iguana Zephyr...who, a year ago with his old owners: ate dog food, lived in a 55g tank (at that size, 3'5"
had no uv, and suffered/suffering from MBD and kidney disease. Igs are wonderful creatures if you give them the effort, time, and research to keep them happy/healthy.
http://geocities.com/chanseysab/ZephyrInArms.gif
http://geocities.com/chanseysab/ZephyrsHead.gif
Sarah