yes, they definitely need holes for air, air circulation, etc. i use a soldering iron to make holes; u can also use a drill or whatever else can poke nice hole.
make some holes, test temps and humidity. add holes as needed until u think temps/humidity is good to go.
here's a stickie thread on tub set-up u can use as a guide - http://ball-pythons.net/forums/showt...e-Basics-*DUW*
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