Hi! My Brachypelma Hamorii has started to bite the background and rip small chunks off. I don't know why. I have had problems before when I had made the substrate a little too wet for his liking. When the substrate got too damp he climbed up on the wall and ceiling and putting his teeth through the metal net. But I learned from my mistakes and now I have plexiglass under the net so that he can't walk around in the ceiling. His substrate is pretty dry and I'm worried that he will break his teeth off again( that happened when he had stuck his teeth through the metal net but they recovered after a molt). Now (when I'm writing this) he is biting the fake plant that I have put in his enclosure. Does anyone know why he does it? He is about 4 years old and about 4.6- 5 inches in leg span (11.7-12.7 cm).