I would try pinkies first.hoppers might be alittle to big.i had a month old do the same thing.so i just everything from asf to pinky mice. and he took the pinky mouse after a couple of hours of leaving it in there with him.try to do it at night when they are more active and leave a pinky mouse in there close to them that should do the trick.but every snake is diffrent.i hope that helps you tho.