No snake in the wild would confine itself to 18 X 18 inches of ground. Snakes in the wild are constantly on the move for food and water. As long as there are sufficient hides, some good decorations, and proper belly heat, the tank size doesn't matter to the corn. I would probably put two water bowls in a large tank though. The hard part is finding the corn in a large tank, especially if it hides under the substrate, as many hatchlings and younger corns do. I would feed the corn in a separate container, at least until it gets older.
I did an experiment with a young corn snake several years ago, and you could try it too. I had a 40 gallon tank with a screen top. I was wondering if the tank was too large for the corn. I propped a piece of cardboard in the tank with rocks so that the corn was limited to about a 5 gallon space. The cardboard was about 12 inches tall and up against the glass on the sides. Now if the corn was secure in his 5 gallon side he could stay there. But it wasn't long before he climbed over the cardboard and was slithering around the big part of the tank. So much for insecurity, but don't be surprised if most of the action occurs at night. Young corns feel safer when they are nocturnal.
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