Excessive shedding is generally caused by a bacterial infection due to poor husbandry. From your description, the frog was not cared for properly in the past. These frogs have a special skin secretion that has antifungal, antibacterial and antiviral chemicals which protects them from disease or injury. Poor husbandry breaks down this barrier. I suggest you use a water conditioner called Stress-Coat which helps repair damaged skin. I have been using this product for many years with my ACFs and never had any problems with disease. Given time, these frogs may heal themselves. However, as an ACF keeper, you need to remain vigilant. If there is any unusual discoloration, post ASAP with pictures, if possible or a complete description. Keep the temperature between 68-72 (F). Check water chemistry often. If you let me know, I can give you optimum specifications. Good luck!