I hope the OP has fed the snake more than once since he posted all of this. If not, then it's not receiving a proper amount of food, either.

It's disturbing when a person feels the need to justify incorrect husbandry. If the snake is eating once a week, then the chances are it will be ok--if it is not, then the chances are, his setup will be a contributing factor in the snake's decline. It looks very young, and snakes that age need to eat at least once a week.