i used cypress mulch when i had my blackthroat. if i did it over i would use a soil/clay mix. i would just get that from my backyard. awesome monitors. get big quick, so start building a permanent enclosure. i did a 4 foot tall by 4 foot wide by 8 feet long. after he was in there i felt kinda bad cause i really dont think that was big enough. i eventually sold him to a guy in az that had a 10x16 outside enclosure and a nice female waiting for him! anyways, like i said start building. mine went from 14 inches to 6 feet in 3 yrs! was 30 pounds! when he was little he ate insects, worms, and thawed out rodents. as an adult he ate crickets, supermeal worms, nightcrawlers, crayfish, and thawed out rats.