New Gecko Not Eating

We just got a new gecko about three days ago and she has yet to eat. We have another gecko that we had about two weeks before we got the new one, and we've had no problems feeding the older one. She's gotten big, no problems. The problem comes when we try and feed the little guy. We put the geckos in separate feeding tanks so we know both are getting food and that no one is getting left out. But she just wont eat. We do house them together, which I know can sometimes stress a gecko out and cause them not to eat for up to a week or more. But shes just so skinny and small that we at least want to know that she'll be okay. We bought her at Jacks Aquarium and they house their geckos in sand, which I know is a controversial thing. Also they only feed them crickets. So we've tried crickets, mealworms, even tried getting her to eat at least one waxworm to get something in her stomach. As of what we've observed she really hasnt gone to the bathroom other than an almost nonexistent drop. So I don't know if something is wrong with her stomach and shes compacted, but we've tried everything. She wont even look at the food so its like she's no where near interested.

If anyone has any tips or ideas about what could be going on we'd greatly appreciate it!!

Okay, you need to quit handling the little one immediately. Babies get very stressed when over handled, and stress can cause them to not eat. Also, new geckos (especially babies) sometimes wont eat for two weeks or more. The baby just needs to be left alone completely in order to adjust to her new enviorment, without being scared out of her mind every day. Also, did you quarentine her before putting her in with your other one? She may have perasites if you say that she is skinny, and if she wasnt quarentined from your other one for 30-60+ days, she couldve passed them to him also. A quarentine period is vital to having healthy geckos. I hope this clears up things a little bit.

Could you also describe, in as much detail as possible, how their setup is? Ie: Substrate, tank size, heating, hides (how many, what kiind), heat source and floor temps, bowls (how many, what kind), etc.

This could help us determine if there is anything else keeping the baby from eating properly