Caring for corn snakes starts with the environment in which they are kept. Although they are one of the smaller pet snakes they none the less need a terrarium or vivarium suitable for their size. Top 5 Best Bedding Substrates for Corn Snake [2022 Review] - ReptileProfy A young snake will be fine in a ten gallon tank while at full adult size a twenty gallon would be needed. Always remember that snakes are extremely adept at escaping out of even the smallest gap so a secure fitting top is essential.