I never used any substrate for babies but I did use washed playsand for the adults and it worked well...they all lived for over 19 years. I put curved pieces of bark from firewood I had in for hides and clay wine coolers too. The plants were usually artificial. Since leos usually use one corner of the cage for the washroom it made the cages easy to clean....just take out a good amount of sand from that area and shove all the sand towards that corner and add some new sand at the other end. I used clay saucers from plant pots for a water dish and changed and cleaned them daily. I had a few rocks in the cage too for decoration making sure they were sitting firmly on the floor of the cage so the leos couldn't dig under them and get squashed. Some had uvb lights and some didn't. They were on shelves so that the light on the shelf below heated the cage above. The lights were at the fronts of the shelves so the back half of the cage was cooler. I put a small lid from a juice bottle in each cake with calcium in it. I misted one end of the cage to provide moisture in the hide at that end leaving the other end dry. I kept three females to one male in each cage. Once in a while a baby would end up in the cage having hatched from an egg I missed digging up. I dusted the insects like I do for the chameleons.
Hope this helps.