Also, cornsnakes as well as most colubrids, are ophiophagus, meaning they eat other snakes. One day you may find your little one gone... and she hadn't escaped the tank.

I'd recommend putting the smaller corn in a 6qt tub until she's eating regularly and has put on some size.

Snakes kept together are generally very stressed, are competing for optimum places to hide, temperatures, food, are are trying to dominate each other if you see them curled up together.

2 snakes, 2 enclosures, unless you want one less snake.