i would love to know also i have to say... my own crested i got this week is also 1 month.. hes in a small exo terra 12-12-18 for the moment but it just look so big for his size...
I have a 3-4 month old in a 30 tall. As long as he seems to be finding his food ok he is fine. 10 gallon is fine though if it is the kind that has a sliding screen lid I recommend turning it on to one of its sides as they prefer a tall enclosure over floor space.,
my hatchlings are housed in critter keepers as gex stated. A month old is usualy not exceeding 5-7grams, Large critter keeper would be fine untill 10grams or so.