[header] How to care for a corn snake [title] Get the right sized tank for your snake. [step] Corn snake adults can get to be as big as 5 feet (1.4 m) long. You may not need a 20 gallon (75.7 l) enclosure at start, but eventually you will. 
The enclosure can be either a tank or vivarium. When the snake is small, it is ok to start your pet off in a smaller tank such as a living world faunarium or similar product.