So our little sand boa (pretty sure he's a male) is about six months old, was born last July. He's currently about 13 inches long. He is eating a pinkie mouse twice a week...usually I feed him on Sundays and Wednesdays. I'm wondering how I know if he's getting enough food? When do I (if ever) need to move him up to something bigger? He's eating really well for me and seems content.