Red tail boas are active while young but as they get bigger they will become much lazier. They grow relatively slowly. They are more susceptible to throwing up prey if it is too large, so be aware of that. They change colors a bit too, going from really light to dark, where their "freckles" really pop up. This happens for different reasons ranging from shed to time of day.
Great looking snake btw, it looks just like my hypo pastel. You should also check out Guyana/Suriname "true" red tails, they have some intense markings.