A 20L is fine. I think a corn, or any snake for that matter, may be more prone to get nose-rub related injuries in a screen cage.



They need moderate humidity. I have not needed to take measures to increase the humidity - the natural humidity in their cage of 40% seems to work fine. If you live in a dry climate, you may need to adjust things.



I would not use a sand or desert-type substrate. Corns naturally live in wooded and other similar areas where the ground covering is predominantly dirt and plant matter. Sand isn't particularly natural, plus it can be drying. My corns like to burrow. I'm using aspen right now, but alternatives such as cypress mulch, repti-bark, or that coconut husk brick will all work well. I don't really like newspaper/paper towels, since my snakes get underneath it.



Heating isn't hard to accomplish at all, unless the ambient room temp is very warm or very cold. A heat pad or a heat lamp, or a combination thereof, is an ideal way of heating the cage. Common room temp on one end, about 82-90 on the other.
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-audri

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