I personally keep my suri at about 88F hot spot via flexwatt and the cage ambient temp is anywhere from 78-80F depending on the day.
For humidity, i keep it anywhere from 65-80%. Again it just depends whether i just watered her plants or it's getting close to time to water them. Using live plants in the cage will give a huge humidity boost plus my snakes seem to actually like the plants.
As for that tub, i would start off with a few holes in the middle to upper sides of the tub and then see how the humidity is after a night. If you need more, then drill a couple more. Better to drill too little than too much as you can always add more but covering the holes kind of sucks.
RI is going to come from too much bacteria or mold or fungus. Thats why you dont want a wet cage. There is a difference between a wet cage and relative humidity. I use aspen in all my cages and still maintain 65-80% air humidity with the live plants. Also too cold and too wet can create an RI just like too dry and too hot can create one too.
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