I'm amazed that you can leave him that long without misting, first of all, but maybe I'm TOO vigilant about keeping the humidity up. Yes, the CGD does mold quickly, even smelling "off" by the next morning sometimes and it's probably better to get rid of it then and start fresh next time. Does your gecko spend his sleeping time on the glass? Crickets cannot climb glass, so if he does, you can probably leave some crickets in with him without worry. If you have a choice, maybe leave slightly smaller crix than he is used to, to minimize damage they could do and temporarily hiding some crix food where the gecko is unlikely to find it is probably a good idea, too. (My geckos are pretty picky eaters and avoid what they don't recognize.) Remember too, that as long as water is available, they can go without food for as long as a week if necessary, probably longer. If you're in a warm climate, keep the air conditioning on so it doesn't cook while you're gone if temps rise suddenly. Enjoy your break!
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Terri
6:10:9 crested geckos: Bear, Goldfish, Kermit, Brimstone, WildSpatter-Spots-to-Spare, White Lips, Big Red, Olive, Smudge, Belle, Brilliant, Tina, Brick, Toni, Beauty, Shine, Randi(y), Squeak, Bling, SqueakII, Stripe, Redhead, Speckles, Fudgefire & BlackCherryMarble (2 brand new hatchlings).