I have two Roughs that I caught when they were around two weeks old (well actually I caught several babies and kept two females). From what I learned the roughs would reach out to be 2-3 feet and like to eat dusted crickets because they're insectevores. Have a tall glass enclouser that is at least 20 gal (they do much better with more room and climbing space). Also if you can have some real tree branches in there because well, they're used to climbing on real trees and such. Also if the scales are keeled (scales overlapping each other) then its a roughy, if the sclaes are flat then its a smooth. Also there are certain regulations in some states that you cant keep smooths. Like I read in texas yu cant because they are limited in numbers. Have a normal humidity and have a good life with the cute little snake!
Also I dont think there should be any diffrence in care between the rough and smooths. Also baby roughs are kinda greyish in color (and super cute!). But do check your staes laws to see if owning a smooth is legal!!