Sorry to hear that Heather. Linkia will die without proper acclimation. I just had it happen, and I acclimated mine for nearly 2 hours, it died 2 days later. Same symptoms as yours. A leg fell off and the middle of him looked like a big blister. It's a bacterial infection and you need to remove it from your tank so it doesn't contaminate. Those linkias are a tough item to keep!