If you open the tub once a day that's enough "ventilation" so work backwards from there. A tub will hold too much humidity with no holes, so start with one or two on each side, and use a hygrometer (available at most snake suppliers) to see after a day if it is perfect yet. If it's more than 80% or if there is a lot of condensation then try some more holes. The rest depends on things like the relative humidity of the room, and if you have a soaking pool inside and other stuff so just experiment.

Caden

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