friends.....or not !

Question
Hi Diane,
i have developed a problem in the last couple of nites, i own a green iguana and a crested gecko. they have for a year up till now got on together perfectly in the same cage. but 2 nites ago the gecko ( stick ) started to attack Sid my iguana. this went on all nite and by the morning sid was looking very worse for ware. in the day i put sid in an outside cage so there is no problem but wen i brought her in last nite everything was fine till stick woke up and made a bee line for her. then proceeded to jump on her again, this time i had to keep her out of the cage for the nite. please help , i dont no wat to do ????

Answer
Hi Matt,

A crested gecko, eats insects and bugs with some fruit in their diet......think of how the crested sees the iguanas tail....it sees it as a big juicy worm just waiting to be eaten...please...separate them ASAP for the health and safety of each of them.
No species should ever be housed together.  Iguanas and cresteds have different care needs with diet, temperatures, uvb, humidity and housing.  An iguana needs to be in a cage that is 5-6 feet high, 6 feet or more long and at least 3 feet deep.  A crested gecko can live all its life in a 30 gallon high tank.  An iguana depends on uvb to be able to get the calcium from the foods they eat.  Without it they will die...a crested gecko doesn't need uvb.  An iguana requires very high humidity.  Crested requires moderate humidity.  An iguana eats nothing but vegetables, greens, fruits.  A crested geckos main diet is insects, which are deadly to an iguana.
You say that they have been housed for a yr together.  At a year of age, the iguana should be at least a total length of 24 inches or more...
You need to separate them ASAP so that they can each get the correct care they need.  
If you need a care sheet on either or both lizards, please let me know and I will send you one.