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My Jackson will be 7 months September 16th. I also have a panther that is a year and a half and a veiled chameleon that is around a year and a half as well.
Its been so busy on here this week I bet it got missed. Pet stores don't often have updated/correct information on care for chameleons. I follow this care guide below for my panther, check it out, maybe you will find it helpful for your little guy.
Panther Chameleon Care Guide
For feeders, I would suggest a variety, just crickets are fine but you can imagine it gets dull eating the same thing every time. I currently have crickets, BSFL, dubia roaches, wax worms (treats) and super worms (treats). I usually also have silkworms and occasionally get horn worms. I buy my crickets from Josh's frogs, the silks from Costal Silks and all other bugs on Dubia.com. On Saturday I feed my 'treat bugs' but all other days I mix up the other staple feeders for their variety. I'll include a document for you to check out that has a list of good feeders for your little guy.
If your chameleon has only eaten crickets, chances are he will need time to realize that other bugs are just as yummy. For my juvenile (who also grew up eating crickets) I put 15 crickets in the feeder run cup and a variety of 20 other bugs in a bird feeder cup. At the end of the night just before his lights turn off I remove all bugs, count how many are missing and then I know how much he ate. Don't feed anything bigger than the space between your little guys eyes.
Until your feeder run arrives, you can make one for your chameleon to use. I made this same thing and it worked well for me until my feeder arrived.
Let me know if you have any other questions!