Ratsnakes in general love to climb and actually live in trees, so you might be better off using a display type of setup instead of a tub. They are night and day different from BP as far as strict temps and humidity. I see Black rats when it is 55-60 outside as long as the sun is out. As far as temperment I know a guy in NY that used a Lucy Black rat for schools and camps. I have even been told that wild caught after a little work make excellent pets. But there are still very nasty ones like everyting else. Just remember that they are very strong so if you go for say a 20 long to start with they will pop that lid right off if not secured.