It's a Sumatran short-tail and is overweight (to the point of being unhealthy. And for reference the spine should be visible, not rounded over). I would feed a medium rat every 3-4 weeks. I feed my adults one or two large rats every 3-4 weeks and that is enough for these snakes. Very slow metabolism. That is going to be a great looking snake once it trims down! I love your collection, nice looking animals.