From all I have been able to find, the number of air holes is more dependant upon the humidity levels. That 1/8" gap will get the fresh air the snake needs. I'd put a few 1/8" - 1/4" holes in each side of the tub and then let it sit for a while with water bowls and heat on. Check your humidity. If it's too high, cut a few more holes. If you find the humidity gets too low, put tape over a few holes.
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