This is great advice, thank you Deborah. I just wanted to add, that the tub size is not as important as the hide size and other details for security. I started my 1 month old tiny hatchling in a very large, adult-sized tub, but with tiny hides to choose from and lots of substrate to burrow in. It was also in a rack, so it was very dark adding more security. He flourished and I switch him to thawed rats immediately. He is growing like a weed and a whopping 188 grams at 6 months old.
So, if you don't have a tiny tub, I would say this detail is not as important for security as is:
1) tiny hides as Deborah recommends,
2) a dark areas, no big "display" cases, and keep dark by blacking out the sides or keeping in a rack shelf.
3) substrate to burrow in as Deb recommends.
Theoretically, if you all you had a was a huge 60 gallon aquarium, as long as the temps and humidity were good, and all the sides were covered for darkness, and there was plenty of tiny hides and clutter, and substrate to burrow in, the hatchling would do fine, as it would have the exact same security needs met, just like in the wild.