Tubs aren't air tight so you have enough air holes for sure.
The number of holes will determine the humidity level inside the tub so you may have to add more (less humid) or cover some up (more humid) depending on the humidity in your house.
Check out this thread on cage heating to make sure that you have that set up correctly as well:
http://ball-pythons.net/forums/showt...04#post1845904
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