Knowing your snake’s signs and behavior can help you determine the correct habitat size, but in general, if you’re starting out with a small juvenile tank, you should replace it within two or three years, perhaps sooner, to keep pace. keep up with your snake’s growth. By the time it reaches adulthood, your corn snake should be ready for its large aquarium, which it should enjoy for the rest of its long life. The habitat also needs suitable bedding (such as paper, carpet, or shavings), a large tree trunk or branch, a heater or lamp, and appropriate lighting.