I am finally getting a rack for my ball pythons. About a year ago I built a nice display cage for my first ball python, and then realized that tubs work out much better for a ball python.

So, as soon as a I get my rack, I will have an open display cage. I am thinking along the lines of some sort of colubrid. Maybe a milk, king, or rat snake? The cage has the same footprint as a 29g aquarium 12x30x16 (LxWxH).

What is a good snake that gets to the appropriate size for a cage this size -- and also one that doesn't mind being on display?

Thanks for the help!!