Wasn't that you who said you got him at Petco? If not, sorry. If you are returning him to Petco, chances are he will sit in the back room, untreated & neglected until he dies, unless they decide to put him in the freezer before that. Petco does not take well to "returned" live merchandise. If I were you or your mom, I would keep the gecko & try to get him as healthy as possible, even take him to the vet if you could. If he dies after that, then bring the dead gecko & the vet bills back to Petco & they will refund your money for both. At least this way you would have tried to save him!
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1.0 Chinese water dragon, 0.3 leos, 1.0 adopted iguana, 0.0.2 beardies, 2.0 green anoles, 1.0 blue anole and 2.2 bettas ~My Pets~