Well I am not sure what you mean by professionals but if you mean breeders with a lot of snakes then most of them keep the snakes in rubbermaid type containers on a shelve system with heat tape in the rear.
For a fully grown snake like a cal king a 20 galoon is fine. You could even go smaller.. but if you want a decorative display it would be fine. Best advice I could give is make sure the lid is very secure as all kingsnakes are escape artists and will get out the first time you or someone in your houshold forgets to tightly secure the lid.

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