i was thinkin about getting a box turtle probaly a ornate i was going to get these large enclosurs that are made for ferrets but that would just be when it is cold outside for outside i will be building a pen outside so when its hot he can go outside and roam and get some fresh air. all i need to know is about the indoor tank what should i use as a substrate i see this stuff that looks like little pieces of wood that are for tortoises so is this ok