And why should you switch to rats? It would probably make this snake go on a fast if it were fed anything larger than a rat pup/wean. This is an adult male Ball, who only needs, at the most, 2 adult mice per week to maintain his body weight. I only feed mice to the Balls, and one of my girls who I got in at 780g in April or May, gained 1000 grams in those few months. She's now 1770 empty.

If he eats mice readily(obviously he does), and they are easy for you to get on a regular basis, then keep doing what you're doing. Some of my snakes look at rats like they are the plague and a half. Throw a live mouse in there and it's on like Donkey Kong.

Don't fix what ain't broke.