Enclosure Size

[Justo]

Is a 20gallon tank big enough for a king,corn or milk snakes to live comfortably or would a 30 or 35 be better.

[Simon]

20 gallon long tanks would be good for most king, corn, or milk snakes to live in. But I would recommand only having one per tank....just incase you put two of them in there. (I know that you didn't even state whether or not you'll have more...but just in case)

But I would think that it is a bear minimum for them. Of course, the bigger the better for the adults to live in. They'll be much happier to live in a bigger environment....so that they can move around more...lol