My sick Gecko

Question
Hello, I purchased two geckos from my local Petco in March of this year. It is now winter, and one of my baby geckos is not looking too well. He is very thin all over (tail, legs, neck, and torso), and is very pale. I think he may have lost interest in eating because whenever I put food in front of him he does not acknowledge that it is there.

Answer
 Large pet stores usually buy their animals from unethical breeders and mills.  I would suggest both animals be seen by a good reptile veterinarian for any possible health issues.  If they are together, separate them into equal habitats, a big possiblity is now that they have grown old enough, one is intimidating the other, keeping them from eating.  As a rule, with a few exceptions, reptiles are solitary and do not want a cagemate.