I have a male Mexican red rump tarantula who's about 3 or 4 years old. Within the past couple weeks he stared getting thinner but was still active. His abdomen is now all shriveled up. I always make sure he has water but I thought maybe he wasn't eating so I put him in a smaller container with some crickets to see if he could catch them easier, but still he didn't eat. Then he started getting lethargic and has now stopped moving completely. I'm going to leave him alone in his tank for another week or two to see if maybe he might just be molting. However, I think he may be dead. Any advice???