Good evening! I have not done much interacting on here, but I really need some help. I am relatively new to tarantula keeping. I have had my Mexican red knee for just over a year, cranky little guy, but I love him. In the past couple weeks he ha started acting really off. He is making himself bald from flicking hair, and he just acts agitated and restless. He has always moved around some, but he is moving a lot! Today he started taking up more of a defensive stance with his front two legs pulled up over his body. I have done a few changes, but I don't know where to start! For one, I have fed him some dubia roaches because he is so big, and they just live longer than crickets. I also moved his rank to a lower shelf, which I would think would affect anything, but I don't want to rule out any possibility. About 3 months ago I changed his substrate, and added some activated charcoal as mold had become an issue, but he seemed fine until just about a week ago. Please, if anyone has any ideas, I would greatly appreciate it! I am very attached to this little guy! O, and he had a successful molt right before I changed his substrate, so 3 months ago. Again, thank you!