I need some advice. A while back we had a red tailed boa named Thor, my parents sent him off to a breeder because of how defensive he was [always trying to strike at us and but several of us several times.] He was my ex-step mom's snake and she doesn't want him. The person who is caring for him had just lost his brother who was the breeder, he is doing a great job, but Thor is in such a small cage for his size [about 8 ft] i will be getting him back soon, and trying to give him the best life I can. He is about 17 and with every day handling he WILL calm down, which I can do. But do yall have any advice? My dad and I are taking on a project to build him a huuuge cage in my room, one fit for an 8ft snake. I was thinking some branches and stuff for climbing, some foliage and moss, all that stuff. What substrate is the best? Any and all advice is appreciated!