Chances are, with the right temp range and moisture, most baby kings will not care what the cage size is. I've never seen cage size a concern for kingsnakes like Cal kings and Florida kings. In fact, I have an old polaroid of a baby king in a 40 gal tank when I was young. Snake did just fine.

BUT, it may be much easier to setup a plastic shoebox with 1/4 of the surface area over a heat pad initially. Get the snake so it is consistently feeding without issue. After that, you can move it to whatever you want.

You can also start it out in the 29 gal and see what happens. Provide a moist hide partially over the heat pad. Easiest way for a moist hide is a BPA-free Glad storage container with a hole cut in the side or a corner cut out of the lid, then place damp paper towels in there or damp sphagnum moss. Dehydration is the worst enemy of baby kings, so a damp area that is heated is a must.

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