Now your talking my language! I used to breed Leos, Veiled Chameleons, and bearded dragons. There really easy to breed(Leopard geckos). I used Play sand as substrate and had no issues with impaction some people complain about compaction but never had an issue. Get a disposable Glad container and cut a whole in the side of it big enough leo can get in it. Fill it with playsand and make it wet not to wet just enough that it stay up if the dig a whole. when she is about ready to lay her eggs you can see them in her stomach through the skin they look like 2 white things on both sides of her abdomen the lay 2 eggs in a shot! I'll have to take a pic of my breeder rack that I built I also have a hatchling rack as well if anyone wants to buy them I just don't have the time for the breeding game anymore and my interests changed! I used to have a 120 leos at one time I was feeding them Crickets 2000 a wk and mealworms and waxworms! If ya have any specific ?'s feel free to ask!