I think it is about time to switch to rats anyway, if you choose to. As it gets bigger, feeding 1 rat vs multiple mice would be more convenient and even cost effective. Secondly, I read that rats are recommended for the chunky type of snake (ie Ball pythons, boas, bloods at a young age, etc) because it takes longer to digest through it, thus matches with their slow metabolism and can be fed at a longer feed schedule. Whereas for mice, they work better for more active slender snakes (corns, kings, Children Python, most colubrids) because they can digest it quickly, use up the energy and they usually eat again in a week. Again, that is what I read and I have not found any concrete studies to back this up, though it makes some sense. Either way, if your snake is still hungry after 1 mouse, and it needs more food, feed another or try switching to 1 rat. Please check the size chart for details.