i dust my crickets with rep-cal calcium with d3 (phosphorus free) and rep -cal herptivite.

you can keep crickets in a small kritter keeper with some papertowels, eggcrate, papertowel rolls, etc. you will need to feed the crickets to keep them alive and to gutload them for your geckos. you can choose one of the cricket quencher projects from this page and either the high calcium cricket diet or to cricket chow: http://www.flukerfarms.com/index.asp...TS&Category=22. they also make those all-in-one orange cubes but i don't like those--they are messy, smell funky and get moldy whereas the other cubes just dry up and kind of evaporate if not eaten. you can also give crickets chunks of apple, carrot and raw potato.

you can also offer phoenix worms but not all pet stores carry those. wax worms would be okay as a very occasional treat but are high in fat and shouldn't be fed often. mealworms aren't good because their outer shells are too chitinous for cresteds to digest.