Please defer to others who have actually bred these, BUT, I suspect the UTH is safe as long as it's NOT under the entire container, maybe a third or half at the most- & of course, as long as it's controlled by t-stat. Keep in mind that in smaller containers like this, the heat doesn't all stay on one side either. I would think that it's safer to allow options- warmer & cooler areas. And "from where I sit", I'd leave those options 24/7- day & night.
No matter what some say, there is more than one way to safely raise most of these things- as long as you've got the 'big picture' correct, & as long as you're paying attention. I think it's valuable to get multiple opinions for this reason, then keep them all in mind but follow your gut, based on what you're seeing. Like, if you heat half the container with UTH, & they're always on the OTHER (unheated) side, you probably need to tone it down. Obviously, you need to pay the most attention at the beginning- so no harm is done. 90* does sound pretty warm for such tiny creatures to me, but I've mostly raised snakes.
Again, I won't be insulted if you defer to others breeding specifically these creatures- but keep in mind that in the wild they have temperature options too, not just 90* for 24/7.
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