My family and I attended a local Reptile Expo here in the DFW area. I've wanted to add a corn snake to our family for some time now. We now have Gryff (Corn), Lizzie (Leopard Gecko), Lelu (Bearded Dragon), and Mikey (African Sulcata). I would eventually like to take Gryff to my classroom (middle school), but am giving him some time to acclimate to his new home. I do have one question that I'd like to ask regarding feeders. The breeder told me to look at the largest part of Gryff's body and double that to determine feeder size. That sound right?