Mine don't show much interest in crix either when they're that young except to watch them, like some weird form of entertainment.
I usually dab a bit of the CGD diet on their lips every night or so until I see them licking it. Probably not necessary, but it's hard to tell whether they're eating otherwise, and I feel better when I can witness it.
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Terri
6:10:21 crested geckos: Bear, Goldfish, Kermit, Brimstone, WildSpatter-Spots-to-Spare, White Lips, Big Red, Olive, Smudge, Belle, Brilliant, Tina, Brick, Toni, Beauty, Shine, Randy, Squeak, Bling, Squeaker, Stripe, Redhead, Speckles, Harrys, Penny, BonusBaby, Fudgefire & BlackCherryMarble, and AAAaaaggghhhh 9 new babies since Weds, 7/20.