two geckos - one large, one small?

i have two cresties that are siblings. when i got them, one was very slightly larger than the other, but now, one of them is a LOT bigger. i know both are eating fine... CGD, crickets, and fresh pureed fruit about 6 days a week.
why would one be getting so much bigger? they're both very healthy looking, alert, etc etc. the only thing i can think is maybe the larger one is hunting down more crickets..?
anyone have some ideas, or is this normal?

could just be genetics or individual growth rates. or like you said one is getting more food than the other. try keeping them seperate so there is no competition for food and you rule out that.


vaughn

or maybe one is male and one is female!!! ( if that plays a role in size with cresties)

sex can be a factor in the adult size of cresteds but not in babies or juvies. i'd agree with vaughn in saying that you should separate them for now. one is probably dominate over the other and is getting to the food first and getting more of it. this happens sometimes with cresteds and the only way to remedy it is to remove the smaller one and place it by itself so that it can get enough to eat. once it catchs up in size and both are older and not growing so quickly you can try putting them back together.