At 24 X 12 floor space would be adequate for a 3 foot snake, as cage length plus width equal to the length of the snake is a good general guideline. It is possible a mexican black would exceed that size by the time it is an adult.
The 24 X 24 offers a bit more floor space, but the square design is not as good for colubrids, in my opinion. If you are going to add an extra foot, better to go longer than square. It makes keeping a heat gradient easier and gives them some space to stretch out. Even if you don't see a lot of these guys in the daytime, we found that ours cruised the full cage pretty much every night.
good luck with your mexican black - they are great snakes,
mary v.
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Mary VanderKop
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