it depends more on the size of the royal. do you know its wieght?? at a guess saying it was a june born cb11, i would prob say a 12ltr as it will be slightly more grown on, or maybe an 18 ltr, again depending on how grown on it is. and i would say for both of them a 6x11 heat mat would do, or a 11x11
1.2 royal pythons 0.1 hog island boa 1.0 corn snake sig made by stapey