My B. Smithi is acting up. I've had her the longest and she is the biggest of all my tarantulas at the moment but she has recently been acting very strange. I have her in a 30x30 exo terra with the stock background in it, coco fibre substrate and a cork bark hide which she never uses. Every night since I changed her substrate and cleaned her cage she has be biting off the top left corner of the background. I awoke one morning to find a pile of polystyrene below a huge hole at the top. She has broken off very small parts before but now she has been going all out. I spend most nights at my girlfriends house so don't get to keep my eye on her as much as I'd like. I will post pics soon but I'm on my iPhone at the moment and will have to wait till I get on a computer.