Their colors don't change drastically from hatchling to adult. How well defined the pattern is can change, but not much usually.
You do not have to brumate or hibernate a corn, even to breed, though brumation is often a good way to ensure your corns are "in the mood" and feel the season of breeding is at hand. That said, plenty of people breed corns without brumating.
These guys do very well with low to medium humidity, it's usually not a concern at all with corns. No spraying or anything.
For feeding, I generally go with width of widest part of the body. They can eat surprisingly big meals, but it's also easy to overfeed these guys, as they will readily strike and eat almost all the time.
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