So i have a mainland retic that is doing very well, he eats like a champ and is growing like crazy. Currently he eats 6-8 large adult mice 20Grams each. I have been feeding him these because i accidentally ordered way to many when i bought them for him. I didn't realize that within two months he would go from barely being able to get down two to 6 or 8 barely leaving a mark. I think he's ready for some rats haha, so my question is should i get small or medium rats?