I recently weighed my ball python who is very light. He is 1 year and 3 months old and only 240 grams. Is this a unhealthy weight (he looks healthy to me). He is fed on large mice now. Should I switch him to rats? How should I get him heavier? Thanks! Any help would be appreciated. I would add a picture, but I'm new on this forum and can't figure out how to add one.