How big are the crickets?
Are they free range or in a feeder cup?
Have you noticed the cham drinking?
Are you leaving the crickets in overnight or removing them to re-gutload?
Are you only feeding crickets?
the crickets are very small, and they are free range, i misted the cage in the morning and he was drinking off the leaves fine, the only problem is i havent seen him eat, so far i have left them in over night, so far i have only fed crickets
If the crickets are free ranging - be sure your cham is in an enclosure that is small enough that he can "find" his food. Everywhere I read - a feeder cup is recommended for a cham of your age. It should be situated somewhere in the area of where he basks so that he can see it. Also, any crickets that aren't eaten at the end of the day should be removed so that they can be gut-loaded/dusted again.