I hope you can read this, I translated your post through altavista. Your terrarium design sounds good. How big is your snake? My adult male is not eating much and think that is because it is winter. He usually likes to eat mice of any size. If you have lizards available you may want to try them, though. As long as your snake is not losing weight just be patient and keep offering food. However, if it does lose weight it may be sick. I use a heat light.