That's what you call a death curl.. IF she was molting she would have made and think layer of silk called a molting mat and she'd be on her back.. SHE may be a HE and he might be at the end of his life span as males only have 2 years where was female are 20-30 years.. If he has hooks on the end of his 2nd legs closest the it's mouth its a male and hes dieing.. When he was running around the tank was his way of trying to find a mate before his life was up..