SST are excellent snakes and easy to keep. I don’t have any in my collection now but have kept them in the past. All were super calm snakes that were easy to handle. No biting, no squirming, just easy going.
They are remarkably inactive, like all short tails, they make BPs seem hyperactive.
I disagree with keeping adults in a Christmas tree tub. It’s too narrow. These are short but hefty snakes. I kept adults in 3x2 or 4x2 depending on their bulk.
High humidity is a must otherwise you will be dealing endlessly with bad sheds and stuck eye caps. Humid, not wet.
I primarily fed adults a large rat every two weeks. But all of them would eat anything offered; rats, rabbit, chicken and quail. They drink quite a bit more water than your average python, so keep an eye on the water bowl.