What wood do you guys use? I'm worried that whatever I put in my cage would dangerous for my snake. Most wood around me is cottonwood, dogwood, oak, and locust wood. Let's keep in mind this is bark included. Everywhere I look I see one is dangerous or toxic or something. Some of the wood is so cool and perfectly shaped, but I'd hate to put something in my new bioactive cage with my new boa that can hurt or make him sick!