My female 6 year old glider got the very top of her tail wrapped in a loose thread inside her pouch. I was able to get it loose and totally remove the thread but now after about 2 weeks her tail is turning black. All total it's about half an inch of the end of her tail. She acts normal. Eats normal plays normal but I'm worried about tissue death. Should I take her to a vet or wait and see. Thanks for the advice